def normalize_answer(s):
    '\n    Lower text and remove punctuation, articles and extra whitespace.\n    '
    s = s.lower()
    s = re_punc.sub(' ', s)
    s = re_art.sub(' ', s)
    s = ' '.join(s.split())
    return s
Lower text and remove punctuation, articles and extra whitespace.
def normalize_answer(s):
    '\n    \n    '
    s = s.lower()
    s = re_punc.sub(' ', s)
    s = re_art.sub(' ', s)
    s = ' '.join(s.split())
    return s