python base64 decode出现incorrect padding错误的解决方法

python的base64.decodestring方法做base64解码时报错：

Traceback (most recent call last):  File "/export/www/outofmemory.cn/controllers/user.py", line 136, in decryptPassword    encryptPwd = base64.b64decode(encryptPwd)  File "/usr/lib/python2.7/base64.py", line 76, in b64decode    raise TypeError(msg)TypeError: Incorrect padding

这也算是python的一个坑吧，解决此问题的方法很简单，对base64解码的string补齐等号就可以了，如下代码：

        def decode_base64(data):            """Decode base64, padding being optional.            :param data: Base64 data as an ASCII byte string            :returns: The decoded byte string.            """            missing_padding = 4 - len(data) % 4            if missing_padding:                data += b'='* missing_padding            return base64.decodestring(data)