Extract links from a given html document with you must call as first argument

extract_links.py

#!/usr/bin/env python

import sys
from lxml import html

def main():
	filename = sys.argv[1]

	with open(filename, 'rb') as f:
		lines = f.readlines()

	line = ','.join(lines)
	str = html.document_fromstring(line)
	x = str.xpath('//a/@href')

	with open('urls.txt', 'wb') as f:
		for i in x:
			f.write('{}\n'.format(i))

if __name__ == '__main__':
	main()