Some help needed with small multi-threaded program!

[Oltmans]

I've a small multi-threaded program that is written by keeping
Producer-Consumer pattern in mind. In the Producer part of the program
we create new users by doing a POST to a certain web URL whereas in
the Consumer part of the program we try to login newly created users.
Problem is that program sort of runs fine, however, it never
terminates itself and, more importantly, it doesn't print last-three
lines of the program(which is important for my purposes). I've looked
at the docs, but I couldn't figure out a solution so if someone can
spot the problem and suggest a solution that will be highly
appreciated. Many thanks in advance.

-----
#!/usr/bin/env python

import Queue
import re
import random
import time
import threading
import urllib2
import simplejson
from urllib2 import HTTPError
import urllib

base_url = "http://example.com/"
queue = Queue.Queue()
total_users = 0
#keeps the record of time it takes to create a user
create_user_times = {}
#keeps the record of time it takes to authenticate a user
login_user_times = {}
lock = threading.Lock()
errors = []

class User():
    def
__init__(self,firstName,lastName,email,password,userName,active):
        self.firstName = firstName
        self.lastName = lastName
        self.password = password
        self.email = email
        self.userName = userName
#producer
class CreateUsers(threading.Thread):
    def __init__(self,queue,limit):
        threading.Thread.__init__(self)
        self.queue = queue
        self.limit = limit

    def create_user(self):

        url = base_url + "users/"
        email = "stokeywonder+"+str(random.randrange(0,100000))
+"@example.com"
        obj = {'firstName' : 'Coyotee',
        'lastName' : 'Stevey', 'email' : email,
        'password':'7887',
        'userName':email
        }
        req = urllib2.Request(url)
        req.add_header('User-Agent', 'Mozilla/4.0 (compatible; MSIE
5.5; Windows NT)')
        req.add_header("Content-Type","application/json")
        req.add_data(simplejson.dumps(obj))

        try:

            t = time.time()
            f = urllib2.urlopen(req)
            page = f.read()
            if str(f.code) != '200':
                pass
            else:
                create_user_times[obj['userName']] = str("%.
2f"%float(time.time() - t))
                user = User(**obj)
                self.queue.put(user)

        except:
            errors.append(obj['userName'])

    def run(self):
        global total_users
        global lock

        while total_users < self.limit:
            lock.acquire()
            try:
                total_users += 1
            finally:
                lock.release()

            self.create_user()
            if total_users == self.limit:
                try:
                    self.queue.task_done()
                except ValueError:
                    pass

#Consumer
class TestService(threading.Thread):
    def __init__(self,queue):
        threading.Thread.__init__(self)
        self.queue = queue

    def login(self,user):

        user_name = user.userName
        pwd = user.password
        url = base_url+'u?uName='+user_name+'&pwd='+pwd
        user_agent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
        req = urllib2.Request(url)
        req.add_header('User-Agent', user_agent)
        try:
            t = time.time()

            f = urllib2.urlopen(req)

            if str(f.code) != '200':
                pass
            else:
                login_user_times[user_name] = str("%.
2f"%float(time.time() - t))
        except:
            errors.append(user_name)

    def run (self):
        while True:
            user = self.queue.get()
            if user:
                self.login(user)


if __name__ == "__main__":
    #limit = number of users
    limit = 5
    th = []
    for i in range(2):
        t = CreateUsers(queue,limit)
        t1 = TestService(queue)
        t.start()
        t1.start()
        th.append(t1)
        th.append(t)

    for t in th:
        t.join()
    print create_user_times
    print '---------------'
    print login_user_times