human
I wrote the below code

    def transform_function(key):
        id_or_name = _key_id_or_name_n(key, index)
        if (id_or_name is None):
            return ''
        if isinstance(id_or_name, basestring):
            return KEY_TYPE_NAME
        return KEY_TYPE_ID
    return transform_function

What's a good function header?

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

def key_type_n(index):