# show error
class ReturnTypeError(TypeError):
    pass
class NotFoundOptionsError(ValueError):
    pass
class EmptyFileError(IndexError):
    pass

# type
class list_split(list):
    pass
class list_line(list):
    pass
class list_key(list):
    pass
class list_value(list):
    pass

class tuple_split(tuple):
    pass

class tuple_line(tuple):
    pass

class tuple_key(tuple):
    pass

class tuple_value(tuple):
    pass