Replace x with hexdecimal values

hex.py

#!/usr/bin/python

import sys
from itertools import product

string = sys.argv[1]
values = [l for l in "0123456789ABCDEF"]

# replace x by hexdecimal values

substrings = string.split("x")
ending     = substrings.pop(-1)
substrings = [[s + "x"] for s in substrings]

hex_ss = [[s[0].replace("x", val) for val in values] for s in substrings]
combs  = list(product(*hex_ss))
final  = ["".join(s) + ending for s in combs]

for f in final:
	print f