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

    def remove_articles(text):
        return re_art.sub('    ', text)
    def white_space_fix(text):
        return '    '.join(text.split())
    def remove_punc(text):
        text = re_punc.sub('    ', text)
        exclude = set("_'")
        return ''.join((ch for ch in text if (ch not in exclude)))
    def lower(text):
        return text.lower()
    return white_space_fix(remove_articles(remove_punc(lower(s))))

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

def _normalize_answer(s):