python2 'str' object has no attribute 'decode'

''.decode('hex')

上述代码，报错：

'str' object has no attribute 'decode'

查找原因：

https://stackoverflow.com/questions/29030725/str-object-has-no-attribute-decode

You cannot decode string objects; they are already decoded. You'll have to use a different method.

You can use the codecs.decode() function to apply hex as a codec:

>>> import codecs
>>> codecs.decode('ab', 'hex')
b'\xab'

This applies a Binary transform codec; it is the equivalent of using the base64.b16decode() function, with the input string converted to uppercase:

>>> import base64
>>> base64.b16decode('AB')
b'\xab'

You can also use the binascii.unhexlify() function to 'decode' a sequence of hex digits to bytes:

>>> import binascii
>>> binascii.unhexlify('ab')
b'\xab'

Either way, you'll get a bytes object.

使用第二种方式解决了:

>>> import base64
>>> base64.b16decode('AB')