Compare two simple files and return the differences

list_compare.py

import sys
import os

def read_file(f, split="\n"):
	return open(f).read().split(split)


list1 = read_file(sys.argv[1])
list2 = read_file(sys.argv[2])

for i in sorted(list(set(list1) - set(list2))):
	print i