為什么在python2.7.5中出現錯誤呢
>>> ma = re.match(r'<([\w]+>)\1','<book>booK>')
>>> ma.groups()
Traceback (most recent call last):
? File "<stdin>", line 1, in <module>
AttributeError: 'NoneType' object has no attribute 'groups'
>>> ma.groups()
Traceback (most recent call last):
? File "<stdin>", line 1, in <module>
AttributeError: 'NoneType' object has no attribute 'groups'
2016-10-13
\1 ?--> ?([\w]+>) ?--> book> ? ?
你是K大寫啊, 當然不匹配，所以是NoneType啊
2016-06-14
ma = re.match(r'<([\w]+>)\1','<book>booK>',re.I)
the second 'booK' has a capital letter 'K', change 'K' to 'k'