human
I wrote the below code

    log.debug('Generating    function    for    %s    module', module_name)
    def _run_tests(name, **methods):
        success = True
        pass_msgs = []
        fail_msgs = []
        try:
            log.debug('Retrieving    %s    module.', module_name)
            mod = _get_module(module_name)
            log.debug('Retrieved    module    is    %s', mod.__dict__)
        except NotImplementedError:
            log.exception('The    %s    module    is    not    supported    for    this    backend    and/or    platform.', module_name)
            success = False
            return (success, pass_msgs, fail_msgs)
        if hasattr(inspect, 'signature'):
            mod_sig = inspect.signature(mod)
            parameters = mod_sig.parameters
        else:
            if isinstance(mod.__init__, types.MethodType):
                mod_sig = inspect.getargspec(mod.__init__)
            elif hasattr(mod, '__call__'):
                mod_sig = inspect.getargspec(mod.__call__)
            parameters = mod_sig.args
        additional_args = {}
        for arg in set(parameters).intersection(set(methods)):
            additional_args[arg] = methods.pop(arg)
        try:
            if (len(parameters) > 1):
                modinstance = mod(name, **additional_args)
            else:
                modinstance = mod()
        except TypeError:
            modinstance = None
        methods = {}
        for meth_name in methods:
            if (not meth_name.startswith('_')):
                methods[meth_name] = methods[meth_name]
        for (meth, arg) in methods.items():
            result = _get_method_result(mod, modinstance, meth, arg)
            assertion_result = _apply_assertion(arg, result)
            if (not assertion_result):
                success = False
                fail_msgs.append('Assertion    failed:    {modname}    {n}    {m}    {a}.    Actual    result:    {r}'.format(modname=module_name, n=name, m=meth, a=arg, r=result))
            else:
                pass_msgs.append('Assertion   ...

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

def _copy_function(module_name, name=None):