human
Solve the following python programming problem given the following code:
def application(* args, **kwargs) : 
    "Decorator for methods that apply a brick to inputs.

    Parameters
    ----------
    \\*args, optional
        The application method to wrap.
    \\*\\*kwargs, optional
        Attributes to attach to this application.

    Notes
    -----
    This decorator replaces application methods with :class:`Application`
    instances. It also sets the attributes given as keyword arguments to
    the decorator.

    Note that this decorator purposely does not wrap the original method
    using e.g. :func:`~functools.wraps` or
    :func:`~functools.update_wrapper`, since that would make the class
    impossible to pickle (see notes at :class:`Application`).

    Examples
    --------
    >>> class Foo(Brick):
    ...     @application(inputs=['x'], outputs=['y'])
    ...     def apply(self, x):
    ...         return x + 1
    ...     @application
    ...     def other_apply(self, x):
    ...         return x - 1
    >>> foo = Foo()
    >>> Foo.apply.inputs
    ['x']
    >>> foo.apply.outputs
    ['y']
    >>> Foo.other_apply # doctest: +ELLIPSIS
    <blocks.bricks.base.Application object at ...>

    " 
    if (not ((args and (not kwargs)) or ((not args) and kwargs))) : 
        raise ValueError 
if args : 
        (application_function,) = args 
        application = Application (application_function) 
        return application 
else : 
        def wrap_application(application_function) : 
            application = Application (application_function) 
            for (key, value) in kwargs.items () : 
                setattr (application, key, value) 
return application 
return application_function 

    
    

    Fix the buggy line: return application_function
assistant
#Here is Python code to fix the buggy line: return application_function
.

return def wrap_application(