"""
The MIT License (MIT)

Copyright (c) 2016 Gehad Shaat

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""


def batch_get_item(RequestItems=None, ReturnConsumedCapacity=None):
    """
    :param RequestItems: [REQUIRED]
            A map of one or more table names and, for each table, a map that describes one or more items to retrieve from that table. Each table name can be used only once per BatchGetItem request.
            Each element in the map of items to retrieve consists of the following:
            ConsistentRead - If true , a strongly consistent read is used; if false (the default), an eventually consistent read is used.
            ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide the partition key value. For a composite key, you must provide both the partition key value and the sort key value.
            ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas. If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result. For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            AttributesToGet -
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception. This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
            The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result. Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
            (string) --
            (dict) --Represents a set of primary keys and, for each key, the attributes to retrieve from the table.
            For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide the partition key. For a composite primary key, you must provide both the partition key and the sort key.
            Keys (list) -- [REQUIRED]The primary key attribute values that define the items and the attributes associated with the items.
            (dict) --
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
            AttributesToGet (list) --One or more attributes to retrieve from the table or index. If no attribute names are specified then all attributes will be returned. If any of the specified attributes are not found, they will not appear in the result.
            (string) --
            ConsistentRead (boolean) --The consistency of a read operation. If set to true , then a strongly consistent read is used; otherwise, an eventually consistent read is used.
            ProjectionExpression (string) --A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the ProjectionExpression must be separated by commas.
            If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
            For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            Note
            ProjectionExpression replaces the legacy AttributesToGet parameter.
            ExpressionAttributeNames (dict) --One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            (string) --
            (string) --
            
            
            
    :type RequestItems: dict
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    """
    pass


def batch_write_item(RequestItems=None, ReturnConsumedCapacity=None, ReturnItemCollectionMetrics=None):
    """
    :param RequestItems: [REQUIRED]
            A map of one or more table names and, for each table, a list of operations to be performed (DeleteRequest or PutRequest ). Each element in the map consists of the following:
            DeleteRequest - Perform a DeleteItem operation on the specified item. The item to be deleted is identified by a Key subelement:
            Key - A map of primary key attribute values that uniquely identify the ! item. Each entry in this map consists of an attribute name and an attribute value. For each primary key, you must provide all of the key attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
            PutRequest - Perform a PutItem operation on the specified item. The item to be put is identified by an Item subelement:
            Item - A map of attributes and their values. Each entry in this map consists of an attribute name and an attribute value. Attribute values must not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests that contain empty values will be rejected with a ValidationException exception. If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
            
            (string) --
            (list) --
            (dict) --Represents an operation to perform - either DeleteItem or PutItem . You can only request one of these operations, not both, in a single WriteRequest . If you do need to perform both of these operations, you will need to provide two separate WriteRequest objects.
            PutRequest (dict) --A request to perform a PutItem operation.
            Item (dict) -- [REQUIRED]A map of attribute name to attribute values, representing the primary key of an item to be processed by PutItem . All of the table's primary key attributes must be specified, and their data types must match those of the table's key schema. If any attributes are present in the item which are part of an index key schema for the table, their types must match the index key schema.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
            DeleteRequest (dict) --A request to perform a DeleteItem operation.
            Key (dict) -- [REQUIRED]A map of attribute name to attribute values, representing the primary key of the item to delete. All of the table's primary key attributes must be specified, and their data types must match those of the table's key schema.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
            
            
            
    :type RequestItems: dict
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    :param ReturnItemCollectionMetrics: Determines whether item collection metrics are returned. If set to SIZE , the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    :type ReturnItemCollectionMetrics: string
    """
    pass


def can_paginate(operation_name=None):
    """
    :param operation_name: The operation name. This is the same name
            as the method name on the client. For example, if the
            method name is create_foo, and you'd normally invoke the
            operation as client.create_foo(**kwargs), if the
            create_foo operation can be paginated, you can use the
            call client.get_paginator('create_foo').
            ReturnsTrue if the operation can be paginated,
            False otherwise.
            
    :type operation_name: string
    """
    pass


def create_table(AttributeDefinitions=None, TableName=None, KeySchema=None, LocalSecondaryIndexes=None,
                 GlobalSecondaryIndexes=None, ProvisionedThroughput=None, StreamSpecification=None):
    """
    :param AttributeDefinitions: [REQUIRED]
            An array of attributes that describe the key schema for the table and indexes.
            (dict) --Represents an attribute for describing the key schema for the table and indexes.
            AttributeName (string) -- [REQUIRED]A name for the attribute.
            AttributeType (string) -- [REQUIRED]The data type for the attribute, where:
            S - the attribute is of type String
            N - the attribute is of type Number
            B - the attribute is of type Binary
            
            
    :type AttributeDefinitions: list
    :param TableName: [REQUIRED]
            The name of the table to create.
            
    :type TableName: string
    :param KeySchema: [REQUIRED]
            Specifies the attributes that make up the primary key for a table or an index. The attributes in KeySchema must also be defined in the AttributeDefinitions array. For more information, see Data Model in the Amazon DynamoDB Developer Guide .
            Each KeySchemaElement in the array is composed of:
            AttributeName - The name of this key attribute.
            KeyType - The role that the key attribute will assume:
            HASH - partition key
            RANGE - sort key
            
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            For a simple primary key (partition key), you must provide exactly one element with a KeyType of HASH .
            For a composite primary key (partition key and sort key), you must provide exactly two elements, in this order: The first element must have a KeyType of HASH , and the second element must have a KeyType of RANGE .
            For more information, see Specifying the Primary Key in the Amazon DynamoDB Developer Guide .
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) -- [REQUIRED]The name of a key attribute.
            KeyType (string) -- [REQUIRED]The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            
    :type KeySchema: list
    :param LocalSecondaryIndexes: One or more local secondary indexes (the maximum is five) to be created on the table. Each index is scoped to a given partition key value. There is a 10 GB size limit per partition key value; otherwise, the size of a local secondary index is unconstrained.
            Each local secondary index in the array includes the following:
            IndexName - The name of the local secondary index. Must be unique only for this table.
            KeySchema - Specifies the key schema for the local secondary index. The key schema must begin with the same partition key as the table.
            Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
            ProjectionType - One of the following:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes , summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            
            (dict) --Represents the properties of a local secondary index.
            IndexName (string) -- [REQUIRED]The name of the local secondary index. The name must be unique among all other indexes on this table.
            KeySchema (list) -- [REQUIRED]The complete key schema for the local secondary index, consisting of one or more pairs of attribute names and key types:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) -- [REQUIRED]The name of a key attribute.
            KeyType (string) -- [REQUIRED]The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            Projection (dict) -- [REQUIRED]Represents attributes that are copied (projected) from the table into an index. These are in addition to the primary key attributes and index key attributes, which are automatically projected.
            ProjectionType (string) --The set of attributes that are projected into the index:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes (list) --Represents the non-key attribute names which will be projected into the index.
            For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            (string) --
            
            
    :type LocalSecondaryIndexes: list
    :param GlobalSecondaryIndexes: One or more global secondary indexes (the maximum is five) to be created on the table. Each global secondary index in the array includes the following:
            IndexName - The name of the global secondary index. Must be unique only for this table.
            KeySchema - Specifies the key schema for the global secondary index.
            Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
            ProjectionType - One of the following:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes , summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            ProvisionedThroughput - The provisioned throughput settings for the global secondary index, consisting of read and write capacity units.
            (dict) --Represents the properties of a global secondary index.
            IndexName (string) -- [REQUIRED]The name of the global secondary index. The name must be unique among all other indexes on this table.
            KeySchema (list) -- [REQUIRED]The complete key schema for a global secondary index, which consists of one or more pairs of attribute names and key types:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) -- [REQUIRED]The name of a key attribute.
            KeyType (string) -- [REQUIRED]The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            Projection (dict) -- [REQUIRED]Represents attributes that are copied (projected) from the table into an index. These are in addition to the primary key attributes and index key attributes, which are automatically projected.
            ProjectionType (string) --The set of attributes that are projected into the index:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes (list) --Represents the non-key attribute names which will be projected into the index.
            For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            (string) --
            
            ProvisionedThroughput (dict) -- [REQUIRED]Represents the provisioned throughput settings for a specified table or index. The settings can be modified using the UpdateTable operation.
            For current minimum and maximum provisioned throughput values, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) -- [REQUIRED]The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            WriteCapacityUnits (integer) -- [REQUIRED]The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            
            
    :type GlobalSecondaryIndexes: list
    :param ProvisionedThroughput: [REQUIRED]
            Represents the provisioned throughput settings for a specified table or index. The settings can be modified using the UpdateTable operation.
            For current minimum and maximum provisioned throughput values, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) -- [REQUIRED]The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            WriteCapacityUnits (integer) -- [REQUIRED]The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            
    :type ProvisionedThroughput: dict
    :param StreamSpecification: The settings for DynamoDB Streams on the table. These settings consist of:
            StreamEnabled - Indicates whether Streams is to be enabled (true) or disabled (false).
            StreamViewType - When an item in the table is modified, StreamViewType determines what information is written to the table's stream. Valid values for StreamViewType are:
            KEYS_ONLY - Only the key attributes of the modified item are written to the stream.
            NEW_IMAGE - The entire item, as it appears after it was modified, is written to the stream.
            OLD_IMAGE - The entire item, as it appeared before it was modified, is written to the stream.
            NEW_AND_OLD_IMAGES - Both the new and the old item images of the item are written to the stream.
            
            StreamEnabled (boolean) --Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType (string) --The DynamoDB Streams settings for the table. These settings consist of:
            StreamEnabled - Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType - When an item in the table is modified, StreamViewType determines what information is written to the stream for this table. Valid values for StreamViewType are:
            KEYS_ONLY - Only the key attributes of the modified item are written to the stream.
            NEW_IMAGE - The entire item, as it appears after it was modified, is written to the stream.
            OLD_IMAGE - The entire item, as it appeared before it was modified, is written to the stream.
            NEW_AND_OLD_IMAGES - Both the new and the old item images of the item are written to the stream.
            
            
    :type StreamSpecification: dict
    """
    pass


def delete_item(TableName=None, Key=None, Expected=None, ConditionalOperator=None, ReturnValues=None,
                ReturnConsumedCapacity=None, ReturnItemCollectionMetrics=None, ConditionExpression=None,
                ExpressionAttributeNames=None, ExpressionAttributeValues=None):
    """
    :param TableName: [REQUIRED]
            The name of the table from which to delete the item.
            
    :type TableName: string
    :param Key: [REQUIRED]
            A map of attribute names to AttributeValue objects, representing the primary key of the item to delete.
            For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type Key: dict
    :param Expected: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A map of attribute/condition pairs. Expected provides a conditional block for the DeleteItem operation.
            Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false.
            If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
            If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails.
            Expected contains the following:
            AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used. For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters . For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList . When performing the comparison, DynamoDB uses strongly consistent reads. The following comparison operators are available: EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN  The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            For usage examples of AttributeValueList and ComparisonOperator , see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide .
            For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator :
            Value - A value for DynamoDB to compare with an attribute.
            Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation:
            If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the condition evaluates to true; otherwise the condition evaluate to false.
            If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the condition evaluates to true. If the value is found, despite the assumption that it does not exist, the condition evaluates to false.
            Note that the default value for Exists is true .
            The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
            Note
            This parameter does not support attributes of type List or Map.
            (string) --
            (dict) --Represents a condition to be compared with an attribute value. This condition can be used with DeleteItem , PutItem or UpdateItem operations; if the comparison evaluates to true, the operation succeeds; if not, the operation fails. You can use ExpectedAttributeValue in one of two different ways:
            Use AttributeValueList to specify one or more values to compare against an attribute. Use ComparisonOperator to specify how you want to perform the comparison. If the comparison evaluates to true, then the conditional operation succeeds.
            Use Value to specify a value that DynamoDB will compare against an attribute. If the values match, then ExpectedAttributeValue evaluates to true and the conditional operation succeeds. Optionally, you can also set Exists to false, indicating that you do not expect to find the attribute value in the table. In this case, the conditional operation succeeds only if the comparison evaluates to false.
            Value and Exists are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
            Value (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            Exists (boolean) --Causes DynamoDB to evaluate the value before attempting a conditional operation:
            If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the operation succeeds. If it is not found, the operation fails with a ConditionalCheckFailedException .
            If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the operation succeeds. If the value is found, despite the assumption that it does not exist, the operation fails with a ConditionalCheckFailedException .
            The default setting for Exists is true . If you supply a Value all by itself, DynamoDB assumes the attribute exists: You don't have to set Exists to true , because it is implied.
            DynamoDB returns a ValidationException if:
            Exists is true but there is no Value to check. (You expect a value to exist, but don't specify what that value is.)
            Exists is false but you also provide a Value . (You cannot expect an attribute to have a value, while also expecting it not to exist.)
            ComparisonOperator (string) --A comparator for evaluating attributes in the AttributeValueList . For example, equals, greater than, less than, etc.
            The following comparison operators are available:
            EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
            The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            AttributeValueList (list) --One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
            For type Number, value comparisons are numeric.
            String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters .
            For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide .
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
            
    :type Expected: dict
    :param ConditionalOperator: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A logical operator to apply to the conditions in the Expected map:
            AND - If all of the conditions evaluate to true, then the entire map evaluates to true.
            OR - If at least one of the conditions evaluate to true, then the entire map evaluates to true.
            If you omit ConditionalOperator , then AND is the default.
            The operation will succeed only if the entire map evaluates to true.
            Note
            This parameter does not support attributes of type List or Map.
            
    :type ConditionalOperator: string
    :param ReturnValues: Use ReturnValues if you want to get the item attributes as they appeared before they were deleted. For DeleteItem , the valid values are:
            NONE - If ReturnValues is not specified, or if its value is NONE , then nothing is returned. (This setting is the default for ReturnValues .)
            ALL_OLD - The content of the old item is returned.
            Note
            The ReturnValues parameter is used by several DynamoDB operations; however, DeleteItem does not recognize any values other than NONE or ALL_OLD .
            
    :type ReturnValues: string
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    :param ReturnItemCollectionMetrics: Determines whether item collection metrics are returned. If set to SIZE , the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    :type ReturnItemCollectionMetrics: string
    :param ConditionExpression: A condition that must be satisfied in order for a conditional DeleteItem to succeed.
            An expression can contain any of the following:
            Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size  These function names are case-sensitive.
            Comparison operators: = | #x3C;#x3E; | #x3C; | #x3E; | #x3C;= | #x3E;= | BETWEEN | IN
            Logical operators: AND | OR | NOT
            For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            Note
            ConditionExpression replaces the legacy ConditionalOperator and Expected parameters.
            
    :type ConditionExpression: string
    :param ExpressionAttributeNames: One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            (string) --
            (string) --
            
    :type ExpressionAttributeNames: dict
    :param ExpressionAttributeValues: One or more values that can be substituted in an expression.
            Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
            Available | Backordered | Discontinued
            You would first need to specify ExpressionAttributeValues as follows:
            { ':avail':{'S':'Available'}, ':back':{'S':'Backordered'}, ':disc':{'S':'Discontinued'} }
            You could then use these values in an expression, such as this:
            ProductStatus IN (:avail, :back, :disc)
            For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type ExpressionAttributeValues: dict
    """
    pass


def delete_table(TableName=None):
    """
    :param TableName: [REQUIRED]
            The name of the table to delete.
            Return typedict
            ReturnsResponse Syntax{
              'TableDescription': {
                'AttributeDefinitions': [
                  {
                    'AttributeName': 'string',
                    'AttributeType': 'S'|'N'|'B'
                  },
                ],
                'TableName': 'string',
                'KeySchema': [
                  {
                    'AttributeName': 'string',
                    'KeyType': 'HASH'|'RANGE'
                  },
                ],
                'TableStatus': 'CREATING'|'UPDATING'|'DELETING'|'ACTIVE',
                'CreationDateTime': datetime(2015, 1, 1),
                'ProvisionedThroughput': {
                  'LastIncreaseDateTime': datetime(2015, 1, 1),
                  'LastDecreaseDateTime': datetime(2015, 1, 1),
                  'NumberOfDecreasesToday': 123,
                  'ReadCapacityUnits': 123,
                  'WriteCapacityUnits': 123
                },
                'TableSizeBytes': 123,
                'ItemCount': 123,
                'TableArn': 'string',
                'LocalSecondaryIndexes': [
                  {
                    'IndexName': 'string',
                    'KeySchema': [
                      {
                        'AttributeName': 'string',
                        'KeyType': 'HASH'|'RANGE'
                      },
                    ],
                    'Projection': {
                      'ProjectionType': 'ALL'|'KEYS_ONLY'|'INCLUDE',
                      'NonKeyAttributes': [
                        'string',
                      ]
                    },
                    'IndexSizeBytes': 123,
                    'ItemCount': 123,
                    'IndexArn': 'string'
                  },
                ],
                'GlobalSecondaryIndexes': [
                  {
                    'IndexName': 'string',
                    'KeySchema': [
                      {
                        'AttributeName': 'string',
                        'KeyType': 'HASH'|'RANGE'
                      },
                    ],
                    'Projection': {
                      'ProjectionType': 'ALL'|'KEYS_ONLY'|'INCLUDE',
                      'NonKeyAttributes': [
                        'string',
                      ]
                    },
                    'IndexStatus': 'CREATING'|'UPDATING'|'DELETING'|'ACTIVE',
                    'Backfilling': True|False,
                    'ProvisionedThroughput': {
                      'LastIncreaseDateTime': datetime(2015, 1, 1),
                      'LastDecreaseDateTime': datetime(2015, 1, 1),
                      'NumberOfDecreasesToday': 123,
                      'ReadCapacityUnits': 123,
                      'WriteCapacityUnits': 123
                    },
                    'IndexSizeBytes': 123,
                    'ItemCount': 123,
                    'IndexArn': 'string'
                  },
                ],
                'StreamSpecification': {
                  'StreamEnabled': True|False,
                  'StreamViewType': 'NEW_IMAGE'|'OLD_IMAGE'|'NEW_AND_OLD_IMAGES'|'KEYS_ONLY'
                },
                'LatestStreamLabel': 'string',
                'LatestStreamArn': 'string'
              }
            }
            Response Structure
            (dict) --Represents the output of a DeleteTable operation.
            TableDescription (dict) --Represents the properties of a table.
            AttributeDefinitions (list) --An array of AttributeDefinition objects. Each of these objects describes one attribute in the table and index key schema.
            Each AttributeDefinition object in this array is composed of:
            AttributeName - The name of the attribute.
            AttributeType - The data type for the attribute.
            (dict) --Represents an attribute for describing the key schema for the table and indexes.
            AttributeName (string) --A name for the attribute.
            AttributeType (string) --The data type for the attribute, where:
            S - the attribute is of type String
            N - the attribute is of type Number
            B - the attribute is of type Binary
            
            TableName (string) --The name of the table.
            KeySchema (list) --The primary key structure for the table. Each KeySchemaElement consists of:
            AttributeName - The name of the attribute.
            KeyType - The role of the attribute:
            HASH - partition key
            RANGE - sort key
            
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            For more information about primary keys, see Primary Key in the Amazon DynamoDB Developer Guide .
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) --The name of a key attribute.
            KeyType (string) --The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            TableStatus (string) --The current state of the table:
            CREATING - The table is being created.
            UPDATING - The table is being updated.
            DELETING - The table is being deleted.
            ACTIVE - The table is ready for use.
            CreationDateTime (datetime) --The date and time when the table was created, in UNIX epoch time format.
            ProvisionedThroughput (dict) --The provisioned throughput settings for the table, consisting of read and write capacity units, along with data about increases and decreases.
            LastIncreaseDateTime (datetime) --The date and time of the last provisioned throughput increase for this table.
            LastDecreaseDateTime (datetime) --The date and time of the last provisioned throughput decrease for this table.
            NumberOfDecreasesToday (integer) --The number of provisioned throughput decreases for this table during this UTC calendar day. For current maximums on provisioned throughput decreases, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) --The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . Eventually consistent reads require less effort than strongly consistent reads, so a setting of 50 ReadCapacityUnits per second provides 100 eventually consistent ReadCapacityUnits per second.
            WriteCapacityUnits (integer) --The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException .
            TableSizeBytes (integer) --The total size of the specified table, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount (integer) --The number of items in the specified table. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            TableArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the table.
            LocalSecondaryIndexes (list) --Represents one or more local secondary indexes on the table. Each index is scoped to a given partition key value. Tables with one or more local secondary indexes are subject to an item collection size limit, where the amount of data within a given item collection cannot exceed 10 GB. Each element is composed of:
            IndexName - The name of the local secondary index.
            KeySchema - Specifies the complete index key schema. The attribute names in the key schema must be between 1 and 255 characters (inclusive). The key schema must begin with the same partition key as the table.
            Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
            ProjectionType - One of the following:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes , summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            IndexSizeBytes - Represents the total size of the index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount - Represents the number of items in the index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            If the table is in the DELETING state, no information about indexes will be returned.
            (dict) --Represents the properties of a local secondary index.
            IndexName (string) --Represents the name of the local secondary index.
            KeySchema (list) --The complete key schema for the local secondary index, consisting of one or more pairs of attribute names and key types:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) --The name of a key attribute.
            KeyType (string) --The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            Projection (dict) --Represents attributes that are copied (projected) from the table into an index. These are in addition to the primary key attributes and index key attributes, which are automatically projected.
            ProjectionType (string) --The set of attributes that are projected into the index:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes (list) --Represents the non-key attribute names which will be projected into the index.
            For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            (string) --
            
            IndexSizeBytes (integer) --The total size of the specified index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount (integer) --The number of items in the specified index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            IndexArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the index.
            
            GlobalSecondaryIndexes (list) --The global secondary indexes, if any, on the table. Each index is scoped to a given partition key value. Each element is composed of:
            Backfilling - If true, then the index is currently in the backfilling phase. Backfilling occurs only when a new global secondary index is added to the table; it is the process by which DynamoDB populates the new index with data from the table. (This attribute does not appear for indexes that were created during a CreateTable operation.)
            IndexName - The name of the global secondary index.
            IndexSizeBytes - The total size of the global secondary index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            IndexStatus - The current status of the global secondary index:
            CREATING - The index is being created.
            UPDATING - The index is being updated.
            DELETING - The index is being deleted.
            ACTIVE - The index is ready for use.
            ItemCount - The number of items in the global secondary index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            KeySchema - Specifies the complete index key schema. The attribute names in the key schema must be between 1 and 255 characters (inclusive). The key schema must begin with the same partition key as the table.
            Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
            ProjectionType - One of the following:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes , summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            ProvisionedThroughput - The provisioned throughput settings for the global secondary index, consisting of read and write capacity units, along with data about increases and decreases.
            If the table is in the DELETING state, no information about indexes will be returned.
            (dict) --Represents the properties of a global secondary index.
            IndexName (string) --The name of the global secondary index.
            KeySchema (list) --The complete key schema for a global secondary index, which consists of one or more pairs of attribute names and key types:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) --The name of a key attribute.
            KeyType (string) --The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            Projection (dict) --Represents attributes that are copied (projected) from the table into an index. These are in addition to the primary key attributes and index key attributes, which are automatically projected.
            ProjectionType (string) --The set of attributes that are projected into the index:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes (list) --Represents the non-key attribute names which will be projected into the index.
            For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            (string) --
            
            IndexStatus (string) --The current state of the global secondary index:
            CREATING - The index is being created.
            UPDATING - The index is being updated.
            DELETING - The index is being deleted.
            ACTIVE - The index is ready for use.
            Backfilling (boolean) --Indicates whether the index is currently backfilling. Backfilling is the process of reading items from the table and determining whether they can be added to the index. (Not all items will qualify: For example, a partition key cannot have any duplicate values.) If an item can be added to the index, DynamoDB will do so. After all items have been processed, the backfilling operation is complete and Backfilling is false.
            Note
            For indexes that were created during a CreateTable operation, the Backfilling attribute does not appear in the DescribeTable output.
            ProvisionedThroughput (dict) --Represents the provisioned throughput settings for the table, consisting of read and write capacity units, along with data about increases and decreases.
            LastIncreaseDateTime (datetime) --The date and time of the last provisioned throughput increase for this table.
            LastDecreaseDateTime (datetime) --The date and time of the last provisioned throughput decrease for this table.
            NumberOfDecreasesToday (integer) --The number of provisioned throughput decreases for this table during this UTC calendar day. For current maximums on provisioned throughput decreases, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) --The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . Eventually consistent reads require less effort than strongly consistent reads, so a setting of 50 ReadCapacityUnits per second provides 100 eventually consistent ReadCapacityUnits per second.
            WriteCapacityUnits (integer) --The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException .
            IndexSizeBytes (integer) --The total size of the specified index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount (integer) --The number of items in the specified index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            IndexArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the index.
            
            StreamSpecification (dict) --The current DynamoDB Streams configuration for the table.
            StreamEnabled (boolean) --Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType (string) --The DynamoDB Streams settings for the table. These settings consist of:
            StreamEnabled - Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType - When an item in the table is modified, StreamViewType determines what information is written to the stream for this table. Valid values for StreamViewType are:
            KEYS_ONLY - Only the key attributes of the modified item are written to the stream.
            NEW_IMAGE - The entire item, as it appears after it was modified, is written to the stream.
            OLD_IMAGE - The entire item, as it appeared before it was modified, is written to the stream.
            NEW_AND_OLD_IMAGES - Both the new and the old item images of the item are written to the stream.
            
            LatestStreamLabel (string) --A timestamp, in ISO 8601 format, for this stream.
            Note that LatestStreamLabel is not a unique identifier for the stream, because it is possible that a stream from another table might have the same timestamp. However, the combination of the following three elements is guaranteed to be unique:
            the AWS customer ID.
            the table name.
            the StreamLabel .
            LatestStreamArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the latest stream for this table.
            
            
            
    :type TableName: string
    """
    pass


def describe_limits():
    """
    """
    pass


def describe_table(TableName=None):
    """
    :param TableName: [REQUIRED]
            The name of the table to describe.
            Return typedict
            ReturnsResponse Syntax{
              'Table': {
                'AttributeDefinitions': [
                  {
                    'AttributeName': 'string',
                    'AttributeType': 'S'|'N'|'B'
                  },
                ],
                'TableName': 'string',
                'KeySchema': [
                  {
                    'AttributeName': 'string',
                    'KeyType': 'HASH'|'RANGE'
                  },
                ],
                'TableStatus': 'CREATING'|'UPDATING'|'DELETING'|'ACTIVE',
                'CreationDateTime': datetime(2015, 1, 1),
                'ProvisionedThroughput': {
                  'LastIncreaseDateTime': datetime(2015, 1, 1),
                  'LastDecreaseDateTime': datetime(2015, 1, 1),
                  'NumberOfDecreasesToday': 123,
                  'ReadCapacityUnits': 123,
                  'WriteCapacityUnits': 123
                },
                'TableSizeBytes': 123,
                'ItemCount': 123,
                'TableArn': 'string',
                'LocalSecondaryIndexes': [
                  {
                    'IndexName': 'string',
                    'KeySchema': [
                      {
                        'AttributeName': 'string',
                        'KeyType': 'HASH'|'RANGE'
                      },
                    ],
                    'Projection': {
                      'ProjectionType': 'ALL'|'KEYS_ONLY'|'INCLUDE',
                      'NonKeyAttributes': [
                        'string',
                      ]
                    },
                    'IndexSizeBytes': 123,
                    'ItemCount': 123,
                    'IndexArn': 'string'
                  },
                ],
                'GlobalSecondaryIndexes': [
                  {
                    'IndexName': 'string',
                    'KeySchema': [
                      {
                        'AttributeName': 'string',
                        'KeyType': 'HASH'|'RANGE'
                      },
                    ],
                    'Projection': {
                      'ProjectionType': 'ALL'|'KEYS_ONLY'|'INCLUDE',
                      'NonKeyAttributes': [
                        'string',
                      ]
                    },
                    'IndexStatus': 'CREATING'|'UPDATING'|'DELETING'|'ACTIVE',
                    'Backfilling': True|False,
                    'ProvisionedThroughput': {
                      'LastIncreaseDateTime': datetime(2015, 1, 1),
                      'LastDecreaseDateTime': datetime(2015, 1, 1),
                      'NumberOfDecreasesToday': 123,
                      'ReadCapacityUnits': 123,
                      'WriteCapacityUnits': 123
                    },
                    'IndexSizeBytes': 123,
                    'ItemCount': 123,
                    'IndexArn': 'string'
                  },
                ],
                'StreamSpecification': {
                  'StreamEnabled': True|False,
                  'StreamViewType': 'NEW_IMAGE'|'OLD_IMAGE'|'NEW_AND_OLD_IMAGES'|'KEYS_ONLY'
                },
                'LatestStreamLabel': 'string',
                'LatestStreamArn': 'string'
              }
            }
            Response Structure
            (dict) --Represents the output of a DescribeTable operation.
            Table (dict) --Represents the properties of a table.
            AttributeDefinitions (list) --An array of AttributeDefinition objects. Each of these objects describes one attribute in the table and index key schema.
            Each AttributeDefinition object in this array is composed of:
            AttributeName - The name of the attribute.
            AttributeType - The data type for the attribute.
            (dict) --Represents an attribute for describing the key schema for the table and indexes.
            AttributeName (string) --A name for the attribute.
            AttributeType (string) --The data type for the attribute, where:
            S - the attribute is of type String
            N - the attribute is of type Number
            B - the attribute is of type Binary
            
            TableName (string) --The name of the table.
            KeySchema (list) --The primary key structure for the table. Each KeySchemaElement consists of:
            AttributeName - The name of the attribute.
            KeyType - The role of the attribute:
            HASH - partition key
            RANGE - sort key
            
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            For more information about primary keys, see Primary Key in the Amazon DynamoDB Developer Guide .
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) --The name of a key attribute.
            KeyType (string) --The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            TableStatus (string) --The current state of the table:
            CREATING - The table is being created.
            UPDATING - The table is being updated.
            DELETING - The table is being deleted.
            ACTIVE - The table is ready for use.
            CreationDateTime (datetime) --The date and time when the table was created, in UNIX epoch time format.
            ProvisionedThroughput (dict) --The provisioned throughput settings for the table, consisting of read and write capacity units, along with data about increases and decreases.
            LastIncreaseDateTime (datetime) --The date and time of the last provisioned throughput increase for this table.
            LastDecreaseDateTime (datetime) --The date and time of the last provisioned throughput decrease for this table.
            NumberOfDecreasesToday (integer) --The number of provisioned throughput decreases for this table during this UTC calendar day. For current maximums on provisioned throughput decreases, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) --The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . Eventually consistent reads require less effort than strongly consistent reads, so a setting of 50 ReadCapacityUnits per second provides 100 eventually consistent ReadCapacityUnits per second.
            WriteCapacityUnits (integer) --The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException .
            TableSizeBytes (integer) --The total size of the specified table, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount (integer) --The number of items in the specified table. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            TableArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the table.
            LocalSecondaryIndexes (list) --Represents one or more local secondary indexes on the table. Each index is scoped to a given partition key value. Tables with one or more local secondary indexes are subject to an item collection size limit, where the amount of data within a given item collection cannot exceed 10 GB. Each element is composed of:
            IndexName - The name of the local secondary index.
            KeySchema - Specifies the complete index key schema. The attribute names in the key schema must be between 1 and 255 characters (inclusive). The key schema must begin with the same partition key as the table.
            Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
            ProjectionType - One of the following:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes , summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            IndexSizeBytes - Represents the total size of the index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount - Represents the number of items in the index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            If the table is in the DELETING state, no information about indexes will be returned.
            (dict) --Represents the properties of a local secondary index.
            IndexName (string) --Represents the name of the local secondary index.
            KeySchema (list) --The complete key schema for the local secondary index, consisting of one or more pairs of attribute names and key types:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) --The name of a key attribute.
            KeyType (string) --The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            Projection (dict) --Represents attributes that are copied (projected) from the table into an index. These are in addition to the primary key attributes and index key attributes, which are automatically projected.
            ProjectionType (string) --The set of attributes that are projected into the index:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes (list) --Represents the non-key attribute names which will be projected into the index.
            For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            (string) --
            
            IndexSizeBytes (integer) --The total size of the specified index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount (integer) --The number of items in the specified index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            IndexArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the index.
            
            GlobalSecondaryIndexes (list) --The global secondary indexes, if any, on the table. Each index is scoped to a given partition key value. Each element is composed of:
            Backfilling - If true, then the index is currently in the backfilling phase. Backfilling occurs only when a new global secondary index is added to the table; it is the process by which DynamoDB populates the new index with data from the table. (This attribute does not appear for indexes that were created during a CreateTable operation.)
            IndexName - The name of the global secondary index.
            IndexSizeBytes - The total size of the global secondary index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            IndexStatus - The current status of the global secondary index:
            CREATING - The index is being created.
            UPDATING - The index is being updated.
            DELETING - The index is being deleted.
            ACTIVE - The index is ready for use.
            ItemCount - The number of items in the global secondary index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            KeySchema - Specifies the complete index key schema. The attribute names in the key schema must be between 1 and 255 characters (inclusive). The key schema must begin with the same partition key as the table.
            Projection - Specifies attributes that are copied (projected) from the table into the index. These are in addition to the primary key attributes and index key attributes, which are automatically projected. Each attribute specification is composed of:
            ProjectionType - One of the following:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes - A list of one or more non-key attribute names that are projected into the secondary index. The total count of attributes provided in NonKeyAttributes , summed across all of the secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            ProvisionedThroughput - The provisioned throughput settings for the global secondary index, consisting of read and write capacity units, along with data about increases and decreases.
            If the table is in the DELETING state, no information about indexes will be returned.
            (dict) --Represents the properties of a global secondary index.
            IndexName (string) --The name of the global secondary index.
            KeySchema (list) --The complete key schema for a global secondary index, which consists of one or more pairs of attribute names and key types:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) --The name of a key attribute.
            KeyType (string) --The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            Projection (dict) --Represents attributes that are copied (projected) from the table into an index. These are in addition to the primary key attributes and index key attributes, which are automatically projected.
            ProjectionType (string) --The set of attributes that are projected into the index:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes (list) --Represents the non-key attribute names which will be projected into the index.
            For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            (string) --
            
            IndexStatus (string) --The current state of the global secondary index:
            CREATING - The index is being created.
            UPDATING - The index is being updated.
            DELETING - The index is being deleted.
            ACTIVE - The index is ready for use.
            Backfilling (boolean) --Indicates whether the index is currently backfilling. Backfilling is the process of reading items from the table and determining whether they can be added to the index. (Not all items will qualify: For example, a partition key cannot have any duplicate values.) If an item can be added to the index, DynamoDB will do so. After all items have been processed, the backfilling operation is complete and Backfilling is false.
            Note
            For indexes that were created during a CreateTable operation, the Backfilling attribute does not appear in the DescribeTable output.
            ProvisionedThroughput (dict) --Represents the provisioned throughput settings for the table, consisting of read and write capacity units, along with data about increases and decreases.
            LastIncreaseDateTime (datetime) --The date and time of the last provisioned throughput increase for this table.
            LastDecreaseDateTime (datetime) --The date and time of the last provisioned throughput decrease for this table.
            NumberOfDecreasesToday (integer) --The number of provisioned throughput decreases for this table during this UTC calendar day. For current maximums on provisioned throughput decreases, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) --The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . Eventually consistent reads require less effort than strongly consistent reads, so a setting of 50 ReadCapacityUnits per second provides 100 eventually consistent ReadCapacityUnits per second.
            WriteCapacityUnits (integer) --The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException .
            IndexSizeBytes (integer) --The total size of the specified index, in bytes. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            ItemCount (integer) --The number of items in the specified index. DynamoDB updates this value approximately every six hours. Recent changes might not be reflected in this value.
            IndexArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the index.
            
            StreamSpecification (dict) --The current DynamoDB Streams configuration for the table.
            StreamEnabled (boolean) --Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType (string) --The DynamoDB Streams settings for the table. These settings consist of:
            StreamEnabled - Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType - When an item in the table is modified, StreamViewType determines what information is written to the stream for this table. Valid values for StreamViewType are:
            KEYS_ONLY - Only the key attributes of the modified item are written to the stream.
            NEW_IMAGE - The entire item, as it appears after it was modified, is written to the stream.
            OLD_IMAGE - The entire item, as it appeared before it was modified, is written to the stream.
            NEW_AND_OLD_IMAGES - Both the new and the old item images of the item are written to the stream.
            
            LatestStreamLabel (string) --A timestamp, in ISO 8601 format, for this stream.
            Note that LatestStreamLabel is not a unique identifier for the stream, because it is possible that a stream from another table might have the same timestamp. However, the combination of the following three elements is guaranteed to be unique:
            the AWS customer ID.
            the table name.
            the StreamLabel .
            LatestStreamArn (string) --The Amazon Resource Name (ARN) that uniquely identifies the latest stream for this table.
            
            
            
    :type TableName: string
    """
    pass


def generate_presigned_url(ClientMethod=None, Params=None, ExpiresIn=None, HttpMethod=None):
    """
    :param ClientMethod: The client method to presign for
    :type ClientMethod: string
    :param Params: The parameters normally passed to
            ClientMethod.
    :type Params: dict
    :param ExpiresIn: The number of seconds the presigned url is valid
            for. By default it expires in an hour (3600 seconds)
    :type ExpiresIn: int
    :param HttpMethod: The http method to use on the generated url. By
            default, the http method is whatever is used in the method's model.
    :type HttpMethod: string
    """
    pass


def get_item(TableName=None, Key=None, AttributesToGet=None, ConsistentRead=None, ReturnConsumedCapacity=None,
             ProjectionExpression=None, ExpressionAttributeNames=None):
    """
    :param TableName: [REQUIRED]
            The name of the table containing the requested item.
            
    :type TableName: string
    :param Key: [REQUIRED]
            A map of attribute names to AttributeValue objects, representing the primary key of the item to retrieve.
            For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type Key: dict
    :param AttributesToGet: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
            The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
            Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
            (string) --
            
    :type AttributesToGet: list
    :param ConsistentRead: Determines the read consistency model: If set to true , then the operation uses strongly consistent reads; otherwise, the operation uses eventually consistent reads.
    :type ConsistentRead: boolean
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    :param ProjectionExpression: A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
            If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
            For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            Note
            ProjectionExpression replaces the legacy AttributesToGet parameter.
            
    :type ProjectionExpression: string
    :param ExpressionAttributeNames: One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            (string) --
            (string) --
            
    :type ExpressionAttributeNames: dict
    """
    pass


def get_paginator(operation_name=None):
    """
    :param operation_name: The operation name. This is the same name
            as the method name on the client. For example, if the
            method name is create_foo, and you'd normally invoke the
            operation as client.create_foo(**kwargs), if the
            create_foo operation can be paginated, you can use the
            call client.get_paginator('create_foo').
            Raises OperationNotPageableErrorRaised if the operation is not
            pageable. You can use the client.can_paginate method to
            check if an operation is pageable.
            Return typeL{botocore.paginate.Paginator}
            ReturnsA paginator object.
            
    :type operation_name: string
    """
    pass


def get_waiter():
    """
    """
    pass


def list_tables(ExclusiveStartTableName=None, Limit=None):
    """
    :param ExclusiveStartTableName: The first table name that this operation will evaluate. Use the value that was returned for LastEvaluatedTableName in a previous operation, so that you can obtain the next page of results.
    :type ExclusiveStartTableName: string
    :param Limit: A maximum number of table names to return. If this parameter is not specified, the limit is 100.
    :type Limit: integer
    """
    pass


def put_item(TableName=None, Item=None, Expected=None, ReturnValues=None, ReturnConsumedCapacity=None,
             ReturnItemCollectionMetrics=None, ConditionalOperator=None, ConditionExpression=None,
             ExpressionAttributeNames=None, ExpressionAttributeValues=None):
    """
    :param TableName: [REQUIRED]
            The name of the table to contain the item.
            
    :type TableName: string
    :param Item: [REQUIRED]
            A map of attribute name/value pairs, one for each attribute. Only the primary key attributes are required; you can optionally provide other attribute name-value pairs for the item.
            You must provide all of the attributes for the primary key. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide both values for both the partition key and the sort key.
            If you specify any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
            For more information about primary keys, see Primary Key in the Amazon DynamoDB Developer Guide .
            Each element in the Item map is an AttributeValue object.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type Item: dict
    :param Expected: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A map of attribute/condition pairs. Expected provides a conditional block for the PutItem operation.
            Note
            This parameter does not support attributes of type List or Map.
            Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false.
            If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
            If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails.
            Expected contains the following:
            AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used. For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters . For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList . When performing the comparison, DynamoDB uses strongly consistent reads. The following comparison operators are available: EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN  The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            For usage examples of AttributeValueList and ComparisonOperator , see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide .
            For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator :
            Value - A value for DynamoDB to compare with an attribute.
            Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation:
            If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the condition evaluates to true; otherwise the condition evaluate to false.
            If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the condition evaluates to true. If the value is found, despite the assumption that it does not exist, the condition evaluates to false.
            Note that the default value for Exists is true .
            The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
            (string) --
            (dict) --Represents a condition to be compared with an attribute value. This condition can be used with DeleteItem , PutItem or UpdateItem operations; if the comparison evaluates to true, the operation succeeds; if not, the operation fails. You can use ExpectedAttributeValue in one of two different ways:
            Use AttributeValueList to specify one or more values to compare against an attribute. Use ComparisonOperator to specify how you want to perform the comparison. If the comparison evaluates to true, then the conditional operation succeeds.
            Use Value to specify a value that DynamoDB will compare against an attribute. If the values match, then ExpectedAttributeValue evaluates to true and the conditional operation succeeds. Optionally, you can also set Exists to false, indicating that you do not expect to find the attribute value in the table. In this case, the conditional operation succeeds only if the comparison evaluates to false.
            Value and Exists are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
            Value (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            Exists (boolean) --Causes DynamoDB to evaluate the value before attempting a conditional operation:
            If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the operation succeeds. If it is not found, the operation fails with a ConditionalCheckFailedException .
            If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the operation succeeds. If the value is found, despite the assumption that it does not exist, the operation fails with a ConditionalCheckFailedException .
            The default setting for Exists is true . If you supply a Value all by itself, DynamoDB assumes the attribute exists: You don't have to set Exists to true , because it is implied.
            DynamoDB returns a ValidationException if:
            Exists is true but there is no Value to check. (You expect a value to exist, but don't specify what that value is.)
            Exists is false but you also provide a Value . (You cannot expect an attribute to have a value, while also expecting it not to exist.)
            ComparisonOperator (string) --A comparator for evaluating attributes in the AttributeValueList . For example, equals, greater than, less than, etc.
            The following comparison operators are available:
            EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
            The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            AttributeValueList (list) --One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
            For type Number, value comparisons are numeric.
            String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters .
            For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide .
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
            
    :type Expected: dict
    :param ReturnValues: Use ReturnValues if you want to get the item attributes as they appeared before they were updated with the PutItem request. For PutItem , the valid values are:
            NONE - If ReturnValues is not specified, or if its value is NONE , then nothing is returned. (This setting is the default for ReturnValues .)
            ALL_OLD - If PutItem overwrote an attribute name-value pair, then the content of the old item is returned.
            Note
            The ReturnValues parameter is used by several DynamoDB operations; however, PutItem does not recognize any values other than NONE or ALL_OLD .
            
    :type ReturnValues: string
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    :param ReturnItemCollectionMetrics: Determines whether item collection metrics are returned. If set to SIZE , the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    :type ReturnItemCollectionMetrics: string
    :param ConditionalOperator: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A logical operator to apply to the conditions in the Expected map:
            AND - If all of the conditions evaluate to true, then the entire map evaluates to true.
            OR - If at least one of the conditions evaluate to true, then the entire map evaluates to true.
            If you omit ConditionalOperator , then AND is the default.
            The operation will succeed only if the entire map evaluates to true.
            Note
            This parameter does not support attributes of type List or Map.
            
    :type ConditionalOperator: string
    :param ConditionExpression: A condition that must be satisfied in order for a conditional PutItem operation to succeed.
            An expression can contain any of the following:
            Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size  These function names are case-sensitive.
            Comparison operators: = | #x3C;#x3E; | #x3C; | #x3E; | #x3C;= | #x3E;= | BETWEEN | IN
            Logical operators: AND | OR | NOT
            For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            Note
            ConditionExpression replaces the legacy ConditionalOperator and Expected parameters.
            
    :type ConditionExpression: string
    :param ExpressionAttributeNames: One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            (string) --
            (string) --
            
    :type ExpressionAttributeNames: dict
    :param ExpressionAttributeValues: One or more values that can be substituted in an expression.
            Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
            Available | Backordered | Discontinued
            You would first need to specify ExpressionAttributeValues as follows:
            { ':avail':{'S':'Available'}, ':back':{'S':'Backordered'}, ':disc':{'S':'Discontinued'} }
            You could then use these values in an expression, such as this:
            ProductStatus IN (:avail, :back, :disc)
            For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type ExpressionAttributeValues: dict
    """
    pass


def query(TableName=None, IndexName=None, Select=None, AttributesToGet=None, Limit=None, ConsistentRead=None,
          KeyConditions=None, QueryFilter=None, ConditionalOperator=None, ScanIndexForward=None, ExclusiveStartKey=None,
          ReturnConsumedCapacity=None, ProjectionExpression=None, FilterExpression=None, KeyConditionExpression=None,
          ExpressionAttributeNames=None, ExpressionAttributeValues=None):
    """
    :param TableName: [REQUIRED]
            The name of the table containing the requested items.
            
    :type TableName: string
    :param IndexName: The name of an index to query. This index can be any local secondary index or global secondary index on the table. Note that if you use the IndexName parameter, you must also provide TableName.
    :type IndexName: string
    :param Select: The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, the count of matching items, or in the case of an index, some or all of the attributes projected into the index.
            ALL_ATTRIBUTES - Returns all of the item attributes from the specified table or index. If you query a local secondary index, then for each matching item in the index DynamoDB will fetch the entire item from the parent table. If the index is configured to project all item attributes, then all of the data can be obtained from the local secondary index, and no fetching is required.
            ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifying ALL_ATTRIBUTES .
            COUNT - Returns the number of matching items, rather than the matching items themselves.
            SPECIFIC_ATTRIBUTES - Returns only the attributes listed in AttributesToGet . This return value is equivalent to specifying AttributesToGet without specifying any value for Select . If you query a local secondary index and request only attributes that are projected into that index, the operation will read only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB will fetch each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency. If you query a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
            If neither Select nor AttributesToGet are specified, DynamoDB defaults to ALL_ATTRIBUTES when accessing a table, and ALL_PROJECTED_ATTRIBUTES when accessing an index. You cannot use both Select and AttributesToGet together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES . (This usage is equivalent to specifying AttributesToGet without any value for Select .)
            Note
            If you use the ProjectionExpression parameter, then the value for Select can only be SPECIFIC_ATTRIBUTES . Any other value for Select will return an error.
            
    :type Select: string
    :param AttributesToGet: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
            The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
            Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
            You cannot use both AttributesToGet and Select together in a Query request, unless the value for Select is SPECIFIC_ATTRIBUTES . (This usage is equivalent to specifying AttributesToGet without any value for Select .)
            If you query a local secondary index and request only attributes that are projected into that index, the operation will read only the index and not the table. If any of the requested attributes are not projected into the local secondary index, DynamoDB will fetch each of these attributes from the parent table. This extra fetching incurs additional throughput cost and latency.
            If you query a global secondary index, you can only request attributes that are projected into the index. Global secondary index queries cannot fetch attributes from the parent table.
            (string) --
            
    :type AttributesToGet: list
    :param Limit: The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed data set size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey to apply in a subsequent operation to continue the operation. For more information, see Query and Scan in the Amazon DynamoDB Developer Guide .
    :type Limit: integer
    :param ConsistentRead: Determines the read consistency model: If set to true , then the operation uses strongly consistent reads; otherwise, the operation uses eventually consistent reads.
            Strongly consistent reads are not supported on global secondary indexes. If you query a global secondary index with ConsistentRead set to true , you will receive a ValidationException .
            
    :type ConsistentRead: boolean
    :param KeyConditions: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use KeyConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            The selection criteria for the query. For a query on a table, you can have conditions only on the table primary key attributes. You must provide the partition key name and value as an EQ condition. You can optionally provide a second condition, referring to the sort key.
            Note
            If you don't provide a sort key condition, all of the items that match the partition key will be retrieved. If a FilterExpression or QueryFilter is present, it will be applied after the items are retrieved.
            For a query on an index, you can have conditions only on the index key attributes. You must provide the index partition key name and value as an EQ condition. You can optionally provide a second condition, referring to the index sort key.
            Each KeyConditions element consists of an attribute name to compare, along with the following:
            AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used. For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters . For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            ComparisonOperator - A comparator for evaluating attributes, for example, equals, greater than, less than, and so on. For KeyConditions , only the following comparison operators are supported: EQ | LE | LT | GE | GT | BEGINS_WITH | BETWEEN  The following are descriptions of these comparison operators.
            EQ : Equal.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one specified in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            For usage examples of AttributeValueList and ComparisonOperator , see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide .
            (string) --
            (dict) --Represents the selection criteria for a Query or Scan operation:
            For a Query operation, Condition is used for specifying the KeyConditions to use when querying a table or an index. For KeyConditions , only the following comparison operators are supported: EQ | LE | LT | GE | GT | BEGINS_WITH | BETWEEN Condition is also used in a QueryFilter , which evaluates the query results and returns only the desired values.
            For a Scan operation, Condition is used in a ScanFilter , which evaluates the scan results and returns only the desired values.
            AttributeValueList (list) --One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
            For type Number, value comparisons are numeric.
            String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters .
            For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            ComparisonOperator (string) -- [REQUIRED]A comparator for evaluating attributes. For example, equals, greater than, less than, etc.
            The following comparison operators are available:
            EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
            The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            For usage examples of AttributeValueList and ComparisonOperator , see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide .
            
            
    :type KeyConditions: dict
    :param QueryFilter: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A condition that evaluates the query results after the items are read and returns only the desired values.
            This parameter does not support attributes of type List or Map.
            Note
            A QueryFilter is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
            If you provide more than one condition in the QueryFilter map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
            Note that QueryFilter does not allow key attributes. You cannot define a filter condition on a partition key or a sort key.
            Each QueryFilter element consists of an attribute name to compare, along with the following:
            AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the operator specified in ComparisonOperator . For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters . For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values. For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide .
            ComparisonOperator - A comparator for evaluating attributes. For example, equals, greater than, less than, etc. The following comparison operators are available: EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN  For complete descriptions of all comparison operators, see the Condition data type.
            (string) --
            (dict) --Represents the selection criteria for a Query or Scan operation:
            For a Query operation, Condition is used for specifying the KeyConditions to use when querying a table or an index. For KeyConditions , only the following comparison operators are supported: EQ | LE | LT | GE | GT | BEGINS_WITH | BETWEEN Condition is also used in a QueryFilter , which evaluates the query results and returns only the desired values.
            For a Scan operation, Condition is used in a ScanFilter , which evaluates the scan results and returns only the desired values.
            AttributeValueList (list) --One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
            For type Number, value comparisons are numeric.
            String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters .
            For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            ComparisonOperator (string) -- [REQUIRED]A comparator for evaluating attributes. For example, equals, greater than, less than, etc.
            The following comparison operators are available:
            EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
            The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            For usage examples of AttributeValueList and ComparisonOperator , see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide .
            
            
    :type QueryFilter: dict
    :param ConditionalOperator: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A logical operator to apply to the conditions in a QueryFilter map:
            AND - If all of the conditions evaluate to true, then the entire map evaluates to true.
            OR - If at least one of the conditions evaluate to true, then the entire map evaluates to true.
            If you omit ConditionalOperator , then AND is the default.
            The operation will succeed only if the entire map evaluates to true.
            Note
            This parameter does not support attributes of type List or Map.
            
    :type ConditionalOperator: string
    :param ScanIndexForward: Specifies the order for index traversal: If true (default), the traversal is performed in ascending order; if false , the traversal is performed in descending order.
            Items with the same partition key value are stored in sorted order by sort key. If the sort key data type is Number, the results are stored in numeric order. For type String, the results are stored in order of ASCII character code values. For type Binary, DynamoDB treats each byte of the binary data as unsigned.
            If ScanIndexForward is true , DynamoDB returns the results in the order in which they are stored (by sort key value). This is the default behavior. If ScanIndexForward is false , DynamoDB reads the results in reverse order by sort key value, and then returns the results to the client.
            
    :type ScanIndexForward: boolean
    :param ExclusiveStartKey: The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the previous operation.
            The data type for ExclusiveStartKey must be String, Number or Binary. No set data types are allowed.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type ExclusiveStartKey: dict
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    :param ProjectionExpression: A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
            If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
            For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            Note
            ProjectionExpression replaces the legacy AttributesToGet parameter.
            
    :type ProjectionExpression: string
    :param FilterExpression: A string that contains conditions that DynamoDB applies after the Query operation, but before the data is returned to you. Items that do not satisfy the FilterExpression criteria are not returned.
            Note
            A FilterExpression is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
            For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide .
            Note
            FilterExpression replaces the legacy QueryFilter and ConditionalOperator parameters.
            
    :type FilterExpression: string
    :param KeyConditionExpression: The condition that specifies the key value(s) for items to be retrieved by the Query action.
            The condition must perform an equality test on a single partition key value. The condition can also perform one of several comparison tests on a single sort key value. Query can use KeyConditionExpression to retrieve one item with a given partition key value and sort key value, or several items that have the same partition key value but different sort key values.
            The partition key equality test is required, and must be specified in the following format:
            partitionKeyName = :partitionkeyval
            If you also want to provide a condition for the sort key, it must be combined using AND with the condition for the sort key. Following is an example, using the = comparison operator for the sort key:
            partitionKeyName = :partitionkeyval AND sortKeyName = :sortkeyval
            Valid comparisons for the sort key condition are as follows:
            sortKeyName = :sortkeyval - true if the sort key value is equal to :sortkeyval .
            sortKeyName ** :sortkeyval - true if the sort key value is less than :sortkeyval .
            sortKeyName = :sortkeyval - true if the sort key value is less than or equal to :sortkeyval .
            sortKeyName ** :sortkeyval - true if the sort key value is greater than :sortkeyval .
            sortKeyName = :sortkeyval - true if the sort key value is greater than or equal to :sortkeyval .
            sortKeyName BETWEEN :sortkeyval1 AND :sortkeyval2 - true if the sort key value is greater than or equal to :sortkeyval1 , and less than or equal to :sortkeyval2 .
            begins_with ( sortKeyName , :sortkeyval ) - true if the sort key value begins with a particular operand. (You cannot use this function with a sort key that is of type Number.) Note that the function name begins_with is case-sensitive.
            Use the ExpressionAttributeValues parameter to replace tokens such as :partitionval and :sortval with actual values at runtime.
            You can optionally use the ExpressionAttributeNames parameter to replace the names of the partition key and sort key with placeholder tokens. This option might be necessary if an attribute name conflicts with a DynamoDB reserved word. For example, the following KeyConditionExpression parameter causes an error because Size is a reserved word:
            Size = :myval
            To work around this, define a placeholder (such a #S ) to represent the attribute name Size . KeyConditionExpression then is as follows:
            #S = :myval
            For a list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide .
            For more information on ExpressionAttributeNames and ExpressionAttributeValues , see Using Placeholders for Attribute Names and Values in the Amazon DynamoDB Developer Guide .
            Note
            KeyConditionExpression replaces the legacy KeyConditions parameter.
            
    :type KeyConditionExpression: string
    :param ExpressionAttributeNames: One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            (string) --
            (string) --
            
    :type ExpressionAttributeNames: dict
    :param ExpressionAttributeValues: One or more values that can be substituted in an expression.
            Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
            Available | Backordered | Discontinued
            You would first need to specify ExpressionAttributeValues as follows:
            { ':avail':{'S':'Available'}, ':back':{'S':'Backordered'}, ':disc':{'S':'Discontinued'} }
            You could then use these values in an expression, such as this:
            ProductStatus IN (:avail, :back, :disc)
            For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type ExpressionAttributeValues: dict
    """
    pass


def scan(TableName=None, IndexName=None, AttributesToGet=None, Limit=None, Select=None, ScanFilter=None,
         ConditionalOperator=None, ExclusiveStartKey=None, ReturnConsumedCapacity=None, TotalSegments=None,
         Segment=None, ProjectionExpression=None, FilterExpression=None, ExpressionAttributeNames=None,
         ExpressionAttributeValues=None, ConsistentRead=None):
    """
    :param TableName: [REQUIRED]
            The name of the table containing the requested items; or, if you provide IndexName , the name of the table to which that index belongs.
            
    :type TableName: string
    :param IndexName: The name of a secondary index to scan. This index can be any local secondary index or global secondary index. Note that if you use the IndexName parameter, you must also provide TableName .
    :type IndexName: string
    :param AttributesToGet: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ProjectionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            This parameter allows you to retrieve attributes of type List or Map; however, it cannot retrieve individual elements within a List or a Map.
            The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
            Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
            (string) --
            
    :type AttributesToGet: list
    :param Limit: The maximum number of items to evaluate (not necessarily the number of matching items). If DynamoDB processes the number of items up to the limit while processing the results, it stops the operation and returns the matching values up to that point, and a key in LastEvaluatedKey to apply in a subsequent operation, so that you can pick up where you left off. Also, if the processed data set size exceeds 1 MB before DynamoDB reaches this limit, it stops the operation and returns the matching values up to the limit, and a key in LastEvaluatedKey to apply in a subsequent operation to continue the operation. For more information, see Query and Scan in the Amazon DynamoDB Developer Guide .
    :type Limit: integer
    :param Select: The attributes to be returned in the result. You can retrieve all item attributes, specific item attributes, or the count of matching items.
            ALL_ATTRIBUTES - Returns all of the item attributes.
            ALL_PROJECTED_ATTRIBUTES - Allowed only when querying an index. Retrieves all attributes that have been projected into the index. If the index is configured to project all attributes, this return value is equivalent to specifying ALL_ATTRIBUTES .
            COUNT - Returns the number of matching items, rather than the matching items themselves.
            SPECIFIC_ATTRIBUTES - Returns only the attributes listed in AttributesToGet . This return value is equivalent to specifying AttributesToGet without specifying any value for Select .
            If neither Select nor AttributesToGet are specified, DynamoDB defaults to ALL_ATTRIBUTES . You cannot use both AttributesToGet and Select together in a single request, unless the value for Select is SPECIFIC_ATTRIBUTES . (This usage is equivalent to specifying AttributesToGet without any value for Select .)
            
    :type Select: string
    :param ScanFilter: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A condition that evaluates the scan results and returns only the desired values.
            Note
            This parameter does not support attributes of type List or Map.
            If you specify more than one condition in the ScanFilter map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
            Each ScanFilter element consists of an attribute name to compare, along with the following:
            AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the operator specified in ComparisonOperator . For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters . For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values. For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide .
            ComparisonOperator - A comparator for evaluating attributes. For example, equals, greater than, less than, etc. The following comparison operators are available: EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN  For complete descriptions of all comparison operators, see Condition .
            (string) --
            (dict) --Represents the selection criteria for a Query or Scan operation:
            For a Query operation, Condition is used for specifying the KeyConditions to use when querying a table or an index. For KeyConditions , only the following comparison operators are supported: EQ | LE | LT | GE | GT | BEGINS_WITH | BETWEEN Condition is also used in a QueryFilter , which evaluates the query results and returns only the desired values.
            For a Scan operation, Condition is used in a ScanFilter , which evaluates the scan results and returns only the desired values.
            AttributeValueList (list) --One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
            For type Number, value comparisons are numeric.
            String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters .
            For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            ComparisonOperator (string) -- [REQUIRED]A comparator for evaluating attributes. For example, equals, greater than, less than, etc.
            The following comparison operators are available:
            EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
            The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            For usage examples of AttributeValueList and ComparisonOperator , see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide .
            
            
    :type ScanFilter: dict
    :param ConditionalOperator: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use FilterExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A logical operator to apply to the conditions in a ScanFilter map:
            AND - If all of the conditions evaluate to true, then the entire map evaluates to true.
            OR - If at least one of the conditions evaluate to true, then the entire map evaluates to true.
            If you omit ConditionalOperator , then AND is the default.
            The operation will succeed only if the entire map evaluates to true.
            Note
            This parameter does not support attributes of type List or Map.
            
    :type ConditionalOperator: string
    :param ExclusiveStartKey: The primary key of the first item that this operation will evaluate. Use the value that was returned for LastEvaluatedKey in the previous operation.
            The data type for ExclusiveStartKey must be String, Number or Binary. No set data types are allowed.
            In a parallel scan, a Scan request that includes ExclusiveStartKey must specify the same segment whose previous Scan returned the corresponding value of LastEvaluatedKey .
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type ExclusiveStartKey: dict
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    :param TotalSegments: For a parallel Scan request, TotalSegments represents the total number of segments into which the Scan operation will be divided. The value of TotalSegments corresponds to the number of application workers that will perform the parallel scan. For example, if you want to use four application threads to scan a table or an index, specify a TotalSegments value of 4.
            The value for TotalSegments must be greater than or equal to 1, and less than or equal to 1000000. If you specify a TotalSegments value of 1, the Scan operation will be sequential rather than parallel.
            If you specify TotalSegments , you must also specify Segment .
            
    :type TotalSegments: integer
    :param Segment: For a parallel Scan request, Segment identifies an individual segment to be scanned by an application worker.
            Segment IDs are zero-based, so the first segment is always 0. For example, if you want to use four application threads to scan a table or an index, then the first thread specifies a Segment value of 0, the second thread specifies 1, and so on.
            The value of LastEvaluatedKey returned from a parallel Scan request must be used as ExclusiveStartKey with the same segment ID in a subsequent Scan operation.
            The value for Segment must be greater than or equal to 0, and less than the value provided for TotalSegments .
            If you provide Segment , you must also provide TotalSegments .
            
    :type Segment: integer
    :param ProjectionExpression: A string that identifies one or more attributes to retrieve from the specified table or index. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
            If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
            For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            Note
            ProjectionExpression replaces the legacy AttributesToGet parameter.
            
    :type ProjectionExpression: string
    :param FilterExpression: A string that contains conditions that DynamoDB applies after the Scan operation, but before the data is returned to you. Items that do not satisfy the FilterExpression criteria are not returned.
            Note
            A FilterExpression is applied after the items have already been read; the process of filtering does not consume any additional read capacity units.
            For more information, see Filter Expressions in the Amazon DynamoDB Developer Guide .
            Note
            FilterExpression replaces the legacy ScanFilter and ConditionalOperator parameters.
            
    :type FilterExpression: string
    :param ExpressionAttributeNames: One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            (string) --
            (string) --
            
    :type ExpressionAttributeNames: dict
    :param ExpressionAttributeValues: One or more values that can be substituted in an expression.
            Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
            Available | Backordered | Discontinued
            You would first need to specify ExpressionAttributeValues as follows:
            { ':avail':{'S':'Available'}, ':back':{'S':'Backordered'}, ':disc':{'S':'Discontinued'} }
            You could then use these values in an expression, such as this:
            ProductStatus IN (:avail, :back, :disc)
            For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type ExpressionAttributeValues: dict
    :param ConsistentRead: A Boolean value that determines the read consistency model during the scan:
            If ConsistentRead is false , then the data returned from Scan might not contain the results from other recently completed write operations (PutItem, UpdateItem or DeleteItem).
            If ConsistentRead is true , then all of the write operations that completed before the Scan began are guaranteed to be contained in the Scan response.
            The default setting for ConsistentRead is false .
            The ConsistentRead parameter is not supported on global secondary indexes. If you scan a global secondary index with ConsistentRead set to true, you will receive a ValidationException .
            
    :type ConsistentRead: boolean
    """
    pass


def update_item(TableName=None, Key=None, AttributeUpdates=None, Expected=None, ConditionalOperator=None,
                ReturnValues=None, ReturnConsumedCapacity=None, ReturnItemCollectionMetrics=None, UpdateExpression=None,
                ConditionExpression=None, ExpressionAttributeNames=None, ExpressionAttributeValues=None):
    """
    :param TableName: [REQUIRED]
            The name of the table containing the item to update.
            
    :type TableName: string
    :param Key: [REQUIRED]
            The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
            For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type Key: dict
    :param AttributeUpdates: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use UpdateExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            This parameter can be used for modifying top-level attributes; however, it does not support individual list or map elements.
            The names of attributes to be modified, the action to perform on each, and the new value for each. If you are updating an attribute that is an index key attribute for any indexes on that table, the attribute type must match the index key type defined in the AttributesDefinition of the table description. You can use UpdateItem to update any non-key attributes.
            Attribute values cannot be null. String and Binary type attributes must have lengths greater than zero. Set type attributes must not be empty. Requests with empty values will be rejected with a ValidationException exception.
            Each AttributeUpdates element consists of an attribute name to modify, along with the following:
            Value - The new value, if applicable, for this attribute.
            Action - A value that specifies how to perform the update. This action is only valid for an existing attribute whose data type is Number or is a set; do not use ADD for other data types. If an item with the specified primary key is found in the table, the following values perform the following actions:
            PUT - Adds the specified attribute to the item. If the attribute already exists, it is replaced by the new value.
            DELETE - Removes the attribute and its value, if no value is specified for DELETE . The data type of the specified value must match the existing value's data type. If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c] , then the final attribute value is [b] . Specifying an empty set is an error.
            ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
            If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
            Note
            If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value. Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount , but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0 , and finally add 3 to it. The result will be a new itemcount attribute, with a value of 3 .
            If the existing data type is a set, and if Value is also a set, then Value is appended to the existing set. For example, if the attribute value is the set [1,2] , and the ADD action specified [3] , then the final attribute value is [1,2,3] . An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type. Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, Value must also be a set of strings.
            
            If no item with the specified key is found in the table, the following values perform the following actions:
            PUT - Causes DynamoDB to create a new item with the specified primary key, and then adds the attribute.
            DELETE - Nothing happens, because attributes cannot be deleted from a nonexistent item. The operation succeeds, but DynamoDB does not create a new item.
            ADD - Causes DynamoDB to create an item with the supplied primary key and number (or set of numbers) for the attribute value. The only data types allowed are Number and Number Set.
            If you provide any attributes that are part of an index key, then the data types for those attributes must match those of the schema in the table's attribute definition.
            (string) --
            (dict) --For the UpdateItem operation, represents the attributes to be modified, the action to perform on each, and the new value for each.
            Note
            You cannot use UpdateItem to update any primary key attributes. Instead, you will need to delete the item, and then use PutItem to create a new item with new attributes.
            Attribute values cannot be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests with empty values will be rejected with a ValidationException exception.
            Value (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            Action (string) --Specifies how to perform the update. Valid values are PUT (default), DELETE , and ADD . The behavior depends on whether the specified primary key already exists in the table.
            If an item with the specified *Key* is found in the table:
            PUT - Adds the specified attribute to the item. If the attribute already exists, it is replaced by the new value.
            DELETE - If no value is specified, the attribute and its value are removed from the item. The data type of the specified value must match the existing value's data type. If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specified [a,c] , then the final attribute value would be [b] . Specifying an empty set is an error.
            ADD - If the attribute does not already exist, then the attribute and its values are added to the item. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
            If the existing attribute is a number, and if Value is also a number, then the Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
            Note
            If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value. In addition, if you use ADD to update an existing item, and intend to increment or decrement an attribute value which does not yet exist, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update does not yet have an attribute named itemcount , but you decide to ADD the number 3 to this attribute anyway, even though it currently does not exist. DynamoDB will create the itemcount attribute, set its initial value to 0 , and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3 .
            If the existing data type is a set, and if the Value is also a set, then the Value is added to the existing set. (This is a set operation, not mathematical addition.) For example, if the attribute value was the set [1,2] , and the ADD action specified [3] , then the final attribute value would be [1,2,3] . An error occurs if an Add action is specified for a set attribute and the attribute type specified does not match the existing set type. Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings. The same holds true for number sets and binary sets.
            This action is only valid for an existing attribute whose data type is number or is a set. Do not use ADD for any other data types.
            If no item with the specified *Key* is found:
            PUT - DynamoDB creates a new item with the specified primary key, and then adds the attribute.
            DELETE - Nothing happens; there is no attribute to delete.
            ADD - DynamoDB creates an item with the supplied primary key and number (or set of numbers) for the attribute value. The only data types allowed are number and number set; no other data types can be specified.
            
            
    :type AttributeUpdates: dict
    :param Expected: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A map of attribute/condition pairs. Expected provides a conditional block for the UpdateItem operation.
            Each element of Expected consists of an attribute name, a comparison operator, and one or more values. DynamoDB compares the attribute with the value(s) you supplied, using the comparison operator. For each Expected element, the result of the evaluation is either true or false.
            If you specify more than one element in the Expected map, then by default all of the conditions must evaluate to true. In other words, the conditions are ANDed together. (You can use the ConditionalOperator parameter to OR the conditions instead. If you do this, then at least one of the conditions must evaluate to true, rather than all of them.)
            If the Expected map evaluates to true, then the conditional operation succeeds; otherwise, it fails.
            Expected contains the following:
            AttributeValueList - One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used. For type Number, value comparisons are numeric. String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters . For type Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            ComparisonOperator - A comparator for evaluating attributes in the AttributeValueList . When performing the comparison, DynamoDB uses strongly consistent reads. The following comparison operators are available: EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN  The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            For usage examples of AttributeValueList and ComparisonOperator , see Legacy Conditional Parameters in the Amazon DynamoDB Developer Guide .
            For backward compatibility with previous DynamoDB releases, the following parameters can be used instead of AttributeValueList and ComparisonOperator :
            Value - A value for DynamoDB to compare with an attribute.
            Exists - A Boolean value that causes DynamoDB to evaluate the value before attempting the conditional operation:
            If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the condition evaluates to true; otherwise the condition evaluate to false.
            If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the condition evaluates to true. If the value is found, despite the assumption that it does not exist, the condition evaluates to false.
            Note that the default value for Exists is true .
            The Value and Exists parameters are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
            Note
            This parameter does not support attributes of type List or Map.
            (string) --
            (dict) --Represents a condition to be compared with an attribute value. This condition can be used with DeleteItem , PutItem or UpdateItem operations; if the comparison evaluates to true, the operation succeeds; if not, the operation fails. You can use ExpectedAttributeValue in one of two different ways:
            Use AttributeValueList to specify one or more values to compare against an attribute. Use ComparisonOperator to specify how you want to perform the comparison. If the comparison evaluates to true, then the conditional operation succeeds.
            Use Value to specify a value that DynamoDB will compare against an attribute. If the values match, then ExpectedAttributeValue evaluates to true and the conditional operation succeeds. Optionally, you can also set Exists to false, indicating that you do not expect to find the attribute value in the table. In this case, the conditional operation succeeds only if the comparison evaluates to false.
            Value and Exists are incompatible with AttributeValueList and ComparisonOperator . Note that if you use both sets of parameters at once, DynamoDB will return a ValidationException exception.
            Value (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            Exists (boolean) --Causes DynamoDB to evaluate the value before attempting a conditional operation:
            If Exists is true , DynamoDB will check to see if that attribute value already exists in the table. If it is found, then the operation succeeds. If it is not found, the operation fails with a ConditionalCheckFailedException .
            If Exists is false , DynamoDB assumes that the attribute value does not exist in the table. If in fact the value does not exist, then the assumption is valid and the operation succeeds. If the value is found, despite the assumption that it does not exist, the operation fails with a ConditionalCheckFailedException .
            The default setting for Exists is true . If you supply a Value all by itself, DynamoDB assumes the attribute exists: You don't have to set Exists to true , because it is implied.
            DynamoDB returns a ValidationException if:
            Exists is true but there is no Value to check. (You expect a value to exist, but don't specify what that value is.)
            Exists is false but you also provide a Value . (You cannot expect an attribute to have a value, while also expecting it not to exist.)
            ComparisonOperator (string) --A comparator for evaluating attributes in the AttributeValueList . For example, equals, greater than, less than, etc.
            The following comparison operators are available:
            EQ | NE | LE | LT | GE | GT | NOT_NULL | NULL | CONTAINS | NOT_CONTAINS | BEGINS_WITH | IN | BETWEEN
            The following are descriptions of each comparison operator.
            EQ : Equal. EQ is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue element of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            NE : Not equal. NE is supported for all datatypes, including lists and maps. AttributeValueList can contain only one AttributeValue of type String, Number, Binary, String Set, Number Set, or Binary Set. If an item contains an AttributeValue of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not equal {'NS':['6', '2', '1']} .
            LE : Less than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            LT : Less than.  AttributeValueList can contain only one AttributeValue of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GE : Greater than or equal.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            GT : Greater than.  AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not equal {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']} .
            NOT_NULL : The attribute exists. NOT_NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the existence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NOT_NULL , the result is a Boolean true . This result is because the attribute 'a ' exists; its data type is not relevant to the NOT_NULL comparison operator.
            NULL : The attribute does not exist. NULL is supported for all datatypes, including lists and maps.
            Note
            This operator tests for the nonexistence of an attribute, not its data type. If the data type of attribute 'a ' is null, and you evaluate it using NULL , the result is a Boolean false . This is because the attribute 'a ' exists; its data type is not relevant to the NULL comparison operator.
            CONTAINS : Checks for a subsequence, or value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is of type String, then the operator checks for a substring match. If the target attribute of the comparison is of type Binary, then the operator looks for a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it finds an exact match with any member of the set. CONTAINS is supported for lists: When evaluating 'a CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            NOT_CONTAINS : Checks for absence of a subsequence, or absence of a value in a set. AttributeValueList can contain only one AttributeValue element of type String, Number, or Binary (not a set type). If the target attribute of the comparison is a String, then the operator checks for the absence of a substring match. If the target attribute of the comparison is Binary, then the operator checks for the absence of a subsequence of the target that matches the input. If the target attribute of the comparison is a set ('SS ', 'NS ', or 'BS '), then the operator evaluates to true if it does not find an exact match with any member of the set. NOT_CONTAINS is supported for lists: When evaluating 'a NOT CONTAINS b ', 'a ' can be a list; however, 'b ' cannot be a set, a map, or a list.
            BEGINS_WITH : Checks for a prefix.  AttributeValueList can contain only one AttributeValue of type String or Binary (not a Number or a set type). The target attribute of the comparison must be of type String or Binary (not a Number or a set type).
            IN : Checks for matching elements within two sets. AttributeValueList can contain one or more AttributeValue elements of type String, Number, or Binary (not a set type). These attributes are compared against an existing set type attribute of an item. If any elements of the input set are present in the item attribute, the expression evaluates to true.
            BETWEEN : Greater than or equal to the first value, and less than or equal to the second value.  AttributeValueList must contain two AttributeValue elements of the same type, either String, Number, or Binary (not a set type). A target attribute matches if the target value is greater than, or equal to, the first element and less than, or equal to, the second element. If an item contains an AttributeValue element of a different type than the one provided in the request, the value does not match. For example, {'S':'6'} does not compare to {'N':'6'} . Also, {'N':'6'} does not compare to {'NS':['6', '2', '1']}
            AttributeValueList (list) --One or more values to evaluate against the supplied attribute. The number of values in the list depends on the ComparisonOperator being used.
            For type Number, value comparisons are numeric.
            String value comparisons for greater than, equals, or less than are based on ASCII character code values. For example, a is greater than A , and a is greater than B . For a list of code values, see http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters .
            For Binary, DynamoDB treats each byte of the binary data as unsigned when it compares binary values.
            For information on specifying data types in JSON, see JSON Data Format in the Amazon DynamoDB Developer Guide .
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
            
    :type Expected: dict
    :param ConditionalOperator: 
            Warning
            This is a legacy parameter, for backward compatibility. New applications should use ConditionExpression instead. Do not combine legacy parameters and expression parameters in a single API call; otherwise, DynamoDB will return a ValidationException exception.
            A logical operator to apply to the conditions in the Expected map:
            AND - If all of the conditions evaluate to true, then the entire map evaluates to true.
            OR - If at least one of the conditions evaluate to true, then the entire map evaluates to true.
            If you omit ConditionalOperator , then AND is the default.
            The operation will succeed only if the entire map evaluates to true.
            Note
            This parameter does not support attributes of type List or Map.
            
    :type ConditionalOperator: string
    :param ReturnValues: Use ReturnValues if you want to get the item attributes as they appeared either before or after they were updated. For UpdateItem , the valid values are:
            NONE - If ReturnValues is not specified, or if its value is NONE , then nothing is returned. (This setting is the default for ReturnValues .)
            ALL_OLD - If UpdateItem overwrote an attribute name-value pair, then the content of the old item is returned.
            UPDATED_OLD - The old versions of only the updated attributes are returned.
            ALL_NEW - All of the attributes of the new version of the item are returned.
            UPDATED_NEW - The new versions of only the updated attributes are returned.
            There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No Read Capacity Units are consumed.
            Values returned are strongly consistent
            
    :type ReturnValues: string
    :param ReturnConsumedCapacity: Determines the level of detail about provisioned throughput consumption that is returned in the response:
            INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed. Note that some operations, such as GetItem and BatchGetItem , do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
            TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
            NONE - No ConsumedCapacity details are included in the response.
            
    :type ReturnConsumedCapacity: string
    :param ReturnItemCollectionMetrics: Determines whether item collection metrics are returned. If set to SIZE , the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    :type ReturnItemCollectionMetrics: string
    :param UpdateExpression: An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
            The following action values are available for UpdateExpression .
            SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val SET supports the following functions:
            if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item.
            list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands.
            These function names are case-sensitive.
            REMOVE - Removes one or more attributes from an item.
            ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
            If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
            Note
            If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value. Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount , but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0 , and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3 .
            If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2] , and the ADD action specified [3] , then the final attribute value is [1,2,3] . An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type. Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
            
            Warning
            The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes.
            DELETE - Deletes an element from a set. If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c] , then the final attribute value is [b] . Specifying an empty set is an error.
            Warning
            The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes.
            You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
            For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide .
            Note
            UpdateExpression replaces the legacy AttributeUpdates parameter.
            
    :type UpdateExpression: string
    :param ConditionExpression: A condition that must be satisfied in order for a conditional update to succeed.
            An expression can contain any of the following:
            Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size  These function names are case-sensitive.
            Comparison operators: = | #x3C;#x3E; | #x3C; | #x3E; | #x3C;= | #x3E;= | BETWEEN | IN
            Logical operators: AND | OR | NOT
            For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            Note
            ConditionExpression replaces the legacy ConditionalOperator and Expected parameters.
            
    :type ConditionExpression: string
    :param ExpressionAttributeNames: One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames :
            To access an attribute whose name conflicts with a DynamoDB reserved word.
            To create a placeholder for repeating occurrences of an attribute name in an expression.
            To prevent special characters in an attribute name from being misinterpreted in an expression.
            Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
            Percentile
            The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide ). To work around this, you could specify the following for ExpressionAttributeNames :
            {'#P':'Percentile'}
            You could then use this substitution in an expression, as in this example:
            #P = :val
            Note
            Tokens that begin with the : character are expression attribute values , which are placeholders for the actual value at runtime.
            For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide .
            (string) --
            (string) --
            
    :type ExpressionAttributeNames: dict
    :param ExpressionAttributeValues: One or more values that can be substituted in an expression.
            Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
            Available | Backordered | Discontinued
            You would first need to specify ExpressionAttributeValues as follows:
            { ':avail':{'S':'Available'}, ':back':{'S':'Backordered'}, ':disc':{'S':'Discontinued'} }
            You could then use these values in an expression, such as this:
            ProductStatus IN (:avail, :back, :disc)
            For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide .
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            S (string) --A String data type.
            N (string) --A Number data type.
            B (bytes) --A Binary data type.
            SS (list) --A String Set data type.
            (string) --
            NS (list) --A Number Set data type.
            (string) --
            BS (list) --A Binary Set data type.
            (bytes) --
            M (dict) --A Map of attribute values.
            (string) --
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            
            L (list) --A List of attribute values.
            (dict) --Represents the data for an attribute. You can set one, and only one, of the elements.
            Each attribute in an item is a name-value pair. An attribute can be single-valued or multi-valued set. For example, a book item can have title and authors attributes. Each book has one title but can have many authors. The multi-valued attribute is a set; duplicate values are not allowed.
            NULL (boolean) --A Null data type.
            BOOL (boolean) --A Boolean data type.
            
            
    :type ExpressionAttributeValues: dict
    """
    pass


def update_table(AttributeDefinitions=None, TableName=None, ProvisionedThroughput=None,
                 GlobalSecondaryIndexUpdates=None, StreamSpecification=None):
    """
    :param AttributeDefinitions: An array of attributes that describe the key schema for the table and indexes. If you are adding a new global secondary index to the table, AttributeDefinitions must include the key element(s) of the new index.
            (dict) --Represents an attribute for describing the key schema for the table and indexes.
            AttributeName (string) -- [REQUIRED]A name for the attribute.
            AttributeType (string) -- [REQUIRED]The data type for the attribute, where:
            S - the attribute is of type String
            N - the attribute is of type Number
            B - the attribute is of type Binary
            
            
    :type AttributeDefinitions: list
    :param TableName: [REQUIRED]
            The name of the table to be updated.
            
    :type TableName: string
    :param ProvisionedThroughput: Represents the provisioned throughput settings for a specified table or index. The settings can be modified using the UpdateTable operation.
            For current minimum and maximum provisioned throughput values, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) -- [REQUIRED]The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            WriteCapacityUnits (integer) -- [REQUIRED]The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            
    :type ProvisionedThroughput: dict
    :param GlobalSecondaryIndexUpdates: An array of one or more global secondary indexes for the table. For each index in the array, you can request one action:
            Create - add a new global secondary index to the table.
            Update - modify the provisioned throughput settings of an existing global secondary index.
            Delete - remove a global secondary index from the table.
            For more information, see Managing Global Secondary Indexes in the Amazon DynamoDB Developer Guide .
            (dict) --Represents one of the following:
            A new global secondary index to be added to an existing table.
            New provisioned throughput parameters for an existing global secondary index.
            An existing global secondary index to be removed from an existing table.
            Update (dict) --The name of an existing global secondary index, along with new provisioned throughput settings to be applied to that index.
            IndexName (string) -- [REQUIRED]The name of the global secondary index to be updated.
            ProvisionedThroughput (dict) -- [REQUIRED]Represents the provisioned throughput settings for a specified table or index. The settings can be modified using the UpdateTable operation.
            For current minimum and maximum provisioned throughput values, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) -- [REQUIRED]The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            WriteCapacityUnits (integer) -- [REQUIRED]The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            
            Create (dict) --The parameters required for creating a global secondary index on an existing table:
            IndexName
            KeySchema
            AttributeDefinitions
            Projection
            ProvisionedThroughput
            IndexName (string) -- [REQUIRED]The name of the global secondary index to be created.
            KeySchema (list) -- [REQUIRED]The key schema for the global secondary index.
            (dict) --Represents a single element of a key schema. A key schema specifies the attributes that make up the primary key of a table, or the key attributes of an index.
            A KeySchemaElement represents exactly one attribute of the primary key. For example, a simple primary key would be represented by one KeySchemaElement (for the partition key). A composite primary key would require one KeySchemaElement for the partition key, and another KeySchemaElement for the sort key.
            A KeySchemaElement must be a scalar, top-level attribute (not a nested attribute). The data type must be one of String, Number, or Binary. The attribute cannot be nested within a List or a Map.
            AttributeName (string) -- [REQUIRED]The name of a key attribute.
            KeyType (string) -- [REQUIRED]The role that this key attribute will assume:
            HASH - partition key
            RANGE - sort key
            Note
            The partition key of an item is also known as its hash attribute . The term 'hash attribute' derives from DynamoDB' usage of an internal hash function to evenly distribute data items across partitions, based on their partition key values.
            The sort key of an item is also known as its range attribute . The term 'range attribute' derives from the way DynamoDB stores items with the same partition key physically close together, in sorted order by the sort key value.
            
            Projection (dict) -- [REQUIRED]Represents attributes that are copied (projected) from the table into an index. These are in addition to the primary key attributes and index key attributes, which are automatically projected.
            ProjectionType (string) --The set of attributes that are projected into the index:
            KEYS_ONLY - Only the index and primary keys are projected into the index.
            INCLUDE - Only the specified table attributes are projected into the index. The list of projected attributes are in NonKeyAttributes .
            ALL - All of the table attributes are projected into the index.
            NonKeyAttributes (list) --Represents the non-key attribute names which will be projected into the index.
            For local secondary indexes, the total count of NonKeyAttributes summed across all of the local secondary indexes, must not exceed 20. If you project the same attribute into two different indexes, this counts as two distinct attributes when determining the total.
            (string) --
            
            ProvisionedThroughput (dict) -- [REQUIRED]Represents the provisioned throughput settings for a specified table or index. The settings can be modified using the UpdateTable operation.
            For current minimum and maximum provisioned throughput values, see Limits in the Amazon DynamoDB Developer Guide .
            ReadCapacityUnits (integer) -- [REQUIRED]The maximum number of strongly consistent reads consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            WriteCapacityUnits (integer) -- [REQUIRED]The maximum number of writes consumed per second before DynamoDB returns a ThrottlingException . For more information, see Specifying Read and Write Requirements in the Amazon DynamoDB Developer Guide .
            
            Delete (dict) --The name of an existing global secondary index to be removed.
            IndexName (string) -- [REQUIRED]The name of the global secondary index to be deleted.
            
            
    :type GlobalSecondaryIndexUpdates: list
    :param StreamSpecification: Represents the DynamoDB Streams configuration for the table.
            Note
            You will receive a ResourceInUseException if you attempt to enable a stream on a table that already has a stream, or if you attempt to disable a stream on a table which does not have a stream.
            StreamEnabled (boolean) --Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType (string) --The DynamoDB Streams settings for the table. These settings consist of:
            StreamEnabled - Indicates whether DynamoDB Streams is enabled (true) or disabled (false) on the table.
            StreamViewType - When an item in the table is modified, StreamViewType determines what information is written to the stream for this table. Valid values for StreamViewType are:
            KEYS_ONLY - Only the key attributes of the modified item are written to the stream.
            NEW_IMAGE - The entire item, as it appears after it was modified, is written to the stream.
            OLD_IMAGE - The entire item, as it appeared before it was modified, is written to the stream.
            NEW_AND_OLD_IMAGES - Both the new and the old item images of the item are written to the stream.
            
            
    :type StreamSpecification: dict
    """
    pass
