golfing.py

#!/usr/bin/env python

import sys, argparse as g

p = g.ArgumentParser()
p.add_argument('filename', nargs='?')
a = p.parse_args()

def r(size):
    kc = sys.stdin.read(size)
    nf = open('.e','w')
    nf.write(kc)
    nf.close()
    return kc

def p(t, b):
    print ''.join([ chr(ord(a) ^ ord(b)) for a, b in zip(t, b) ])

if __name__ == "__main__": 
    x = open(a.filename)
    x.seek(0,2)
    l = x.tell()
    x.seek(0,0)
    x = x.read()
    y = r(l)
    p(x, y)