Take two lists and combines them into one with alternating lines from each, like a zipper

ZipperCombine.py

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

import sys
import os

fileOne = sys.argv[1]
fileTwo = sys.argv[2]

with open(fileOne, 'r') as one, open(fileTwo, 'r') as two, open('combined.txt', 'w') as output:
	for line in one:
		output.write(line.rstrip() + '\n')
		output.write(two.readline().strip() + '\n')