Metadata-Version: 2.1
Name: mo-kwargs
Version: 7.132.22039
Summary: Object destructuring of function parameters for Python!
Home-page: https://github.com/klahnakoski/mo-kwargs
Author: Kyle Lahnakoski
Author-email: kyle@lahnakoski.com
License: MPL 2.0
Description: 
        # More KWARGS!
        
        Object destructuring of function parameters for Python!
        
        [![PyPI Latest Release](https://img.shields.io/pypi/v/mo-kwargs.svg)](https://pypi.org/project/mo-kwargs/)
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        [![Downloads](https://pepy.tech/badge/mo-kwargs)](https://pepy.tech/project/mo-kwargs)
        
        
        ## Motivation
        
        Javascript has [object destructuring](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#object_destructuring), and it can be used for function parameters. This has a couple of benefts over Python's keyword arguments:
        
        * Extra caller parameters are ignored (eg `f({a, b, c})`)
        * Duplicate parameters are handled elegantly (eg `f({a, a})`) 
        
        The `mo-kwargs` library provides this functionality with the `@override` decorator, with additional benefits:
         
         * required parameters throw an error if missing, just like regular Python
         * all parameters, even ones not in the argument list, are passed in the optional `kwargs` parameter 
         
        The `@override` decorator adds a `kwargs` argument which can be passed a dict of call parameters; but unlike `**kwargs`, it will not raise duplicate key exceptions.
        
        ## Provide default values
        
        We decorate the `login()` function with `@override`. `username` is a required parameter, and `password` will default to `None`. 
        
                @override
                def login(username, password=None):
                    pass
        
        Define some `dicts` for use with our `kwargs` parameter:
        
                creds = {"userame": "ekyle", "password": "password123"}
                alt_creds = {"username": "klahnakoski"}
        
        
        The simplest case is when we use `kwargs` with no overrides
        
                login(kwargs=creds)
                # SAME AS
                login(**creds)
                # SAME AS
                login(username="ekyle", password="password123")
        
        You may override any property in `kwargs`: In this case it is `password`
        
                login(password="123", kwargs=creds)
                # SAME AS
                login(username="ekyle", password="123")
        
        There is no problem with overriding everything in `kwargs`:
        
                login(username="klahnakoski", password="asd213", kwargs=creds)
                # SAME AS
                login(username="klahnakoski", password="asd213")
        
        You may continue to use `**kwargs`; which provides a way to overlay one parameter template (`creds`) with another (`alt_creds`)
        
                login(kwargs=creds, **alt_creds)
                # SAME AS
                login(username="klahnakoski", password="password123")
        
        ## Handle too many parameters
        
        Sometimes your method parameters come from a configuration file, or some other outside source which is outside your control. There may be more parameters than your method is willing to accept.  
        
                creds = {"username": "ekyle", "password": "password123", "port":9000}
                def login(username, password=None):
                     print(kwargs.get("port"))
        
        Without `mo-kwargs`, passing the `creds` dictionary directly to `login()` would raise a key error
        
                >>> login(**creds)
                Traceback (most recent call last):
                  File "<stdin>", line 1, in <module>
                TypeError: login() got an unexpected keyword argument 'port'
                    
        The traditional solution is to pass the parameters explicitly:
        
                login(username=creds.username, password=creds.password)
        
        but that can get get tedious when done often, or the parameter list get long. `mo-kwargs` allows you to pass the whole dictionary to the `kwargs` parameter; only the parameters used by the method are used:
        
                @override
                def login(username, password=None):
                    pass
                 
                login(kwargs=creds)
                # SAME AS
                login(username=creds.username, password=creds.password)
        
        ## Package all parameters
        
        Your method can accept `kwargs` as a parameter. If it does, ensure it defaults to `None` so that it's not required.
        
                @override
                def login(username, password=None, kwargs=None):
                    print(kwargs.get("username"))
                    print(kwargs.get("port"))
        
        `kwargs` will always be a dict, possibly empty, with the full set of parameters. This is different from using `**kwargs` which contains only the remainder of the keyword parameters.
        
                >>> creds = {"username": "ekyle", "password": "password123", "port":9000}
                >>> login(**creds)
                ekyle
                9000
        
Platform: UNKNOWN
Classifier: Development Status :: 4 - Beta
Classifier: Topic :: Software Development :: Libraries
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.9
Description-Content-Type: text/markdown
Provides-Extra: tests
