human
Here's a good function header given the following:
I wrote the below code

    if (not issubclass(container, collections.MutableSequence)):
        raise TypeError('Container    must    fulfill    the    MutableSequence    contract')
    if ((interface is None) and (method_list is None)):
        raise TypeError("Either    'interface'    or    'method_list'    must    be    defined    on    a    call    to    composite")
    def cls_decorator(cls):
        def no_special_no_private(x):
            return (callable(x) and (not x.__name__.startswith('_')))
        class IterateOver(object, ):
            'Decorator    used    to    patch    methods    in    a    composite.\n\n                                                It    iterates    over    all    the    items    in    the    instance    containing    the\n                                                associated    attribute    and    calls    for    each    of    them    an    attribute\n                                                with    the    same    name\n                                                '
            def __init__(self, name, func=None):
                self.name = name
                self.func = func
            def __get__(self, instance, owner):
                def getter(*args, **kwargs):
                    for item in instance:
                        getattr(item, self.name)(*args, **kwargs)
                if (self.func is not None):
                    getter = functools.wraps(self.func)(getter)
                return getter
        dictionary_for_type_call = {}
        if (method_list is not None):
            dictionary_for_type_call.update(((name, IterateOver(name)) for name in method_list))
        if (interface is not None):
            dictionary_for_type_call.update(((name, IterateOver(name, method)) for (name, method) in inspect.getmembers(interface, predicate=no_special_no_private)))
        dictionary_for_type_call.update(((name, method) for (name, method) in inspect.getmembers(cls, predicate=inspect.ismethod)))
        wrapper_class = type(cls.__name__, (cls, container),...

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

def composite(interface=None, method_list=None, container=list):