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

    if (default_kwarg is None):
        return local_kwarg
    if isinstance(local_kwarg, str):
        return local_kwarg
    if (local_kwarg is None):
        return default_kwarg
    if (not hasattr(default_kwarg, 'items')):
        return local_kwarg
    default_kwarg = from_key_val_list(default_kwarg)
    local_kwarg = from_key_val_list(local_kwarg)
    def get_original_key(original_keys, new_key):
        '\n                                Finds    the    key    from    original_keys    that    case-insensitive    matches    new_key.\n                                '
        for original_key in original_keys:
            if (key.lower() == original_key.lower()):
                return original_key
        return new_key
    kwargs = default_kwarg.copy()
    original_keys = kwargs.keys()
    for (key, value) in local_kwarg.items():
        kwargs[get_original_key(original_keys, key)] = value
    for (k, v) in local_kwarg.items():
        if (v is None):
            del kwargs[k]
    return kwargs

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

def merge_kwargs(local_kwarg, default_kwarg):