base64解码和字节协商字符串

Question

I have base64 encoded string sZCLmg== which is Note . What I am trying to do is to decode it with base64 and then use bytes negotiation to get string Note back.

import base64
encoded = 'sZCLmg==' #sZCLmg==  Note
data = base64.b64decode(encoded)
print data

mylist = []
mylist.append(data)
#print mylist[0][0]
bytes = mylist[0][0]
print (bytes ^ 0xFF)

but I am getting error: ValueError: invalid literal for int() with base 10: '\\xb1' Any idea please what am I doing wrong to get original string Note ?

Answer 1

In Python2, iterating over the literal '\\xb1\\x90\\x8b\\x9a' produces strings, not bytes.

One solution would be to use a bytearray .

>>> ba = bytearray(data)
>>> ''.join(chr(x ^ 0xFF) for x in ba)
'Note'

As @wovano points out in the comments, also it's possible to do this without using a bytearray, like this:

''.join(chr(ord(x) ^ 0xFF) for x in data)