my first useful python-script

#!/usr/bin/env python

import sys, os, zipfile
import zipfile

if 4 != len(sys.argv):
    sys.exit('wrong number of arguments')

cmd_line = 'hg st -X web/js/dev/ -man --rev %s --rev %s | xargs zip %s'
command_line = cmd_line % (sys.argv[1], sys.argv[2], sys.argv[3])

if os.path.exists(sys.argv[3]):
    os.remove(sys.argv[3])

print os.system(command_line)

with zipfile.ZipFile(sys.argv[3], "a") as z:
    open(sys.argv[2], 'w')
    z.write(sys.argv[2], "v_" + sys.argv[2])
    os.remove(sys.argv[2])