python string xor sample

xor.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

import itertools

def xor(s, key):
    key = key * (len(s) / len(key) + 1)
    return ''.join(chr(ord(x) ^ ord(y)) for (x,y) in itertools.izip(s, key)) 

if __name__ == "__main__":
    ret = xor('test','key')
    print ret
    print xor(ret, 'key')

thx for sharing 👍