human
I wrote the below code

    def call_and_assert(*args, **kwargs):
        original_args = copy.deepcopy(args)
        original_kwargs = copy.deepcopy(kwargs)
        result = function(*args, **kwargs)
        assert (result is None), 'Should    return    None    when    called    with    args:    {args}    and    kwargs:    {kwargs}'.format(args=original_args, kwargs=original_kwargs)
        return result
    return call_and_assert

What's a good function header?
assistant
#Here's a good function header.

def returns_None(function):