An error in threading.py?

[Oltmans]

Hi, all. I'm trying to use Mechanize in a multithreaded program--
purpose of which is to fill out a form on a website using concurrent
threads. Guys, trust me I've spent a lot of time to figure out the
problem but I'm completed puzzled. Firstly, I've listed the errors and
then the program listing (with imports omitted)

Error:

Traceback (most recent call last):
  File "C:\Python25\lib\threading.py", line 460, in __bootstrap
    self.run()
  File "tmechanize.py", line 21, in run
    with lock:
NameError: global name 'lock' is not defined


Program:
-------------
#!/usr/bin/env python
requestNumber=0
class Requests(Thread):

    def __init__(self, times):
        Thread.__init__(self)
        self.times=times

        self.html=' '
        self.requestTime={}
        self.starttime=0
        self.endtime=0
        self.br= Browser()
    def run(self):


        for i in range(0,self.times):
            self.starttime=time.clock()
            self.SendRequest()
            self.endtime=time.clock()
            with lock:
                global requestNumber
                requestNumber += 1
                print 'locking the time....'
                self.requestTime[requestNumber]=self.endtime -
self.starttime


    def SendRequest(self): #A class method
        # it sends a request to website using mechanize library
        self.br.add_password("https://example.com/admin", "admin",
"admin")
        res=self.br.open("https://example.com/admin")
        print 'Successfully loggedin '
        self.html=res.read()

        print 'Filling in the form'
        self.br.select_form(name="formOne")
        self.br["textbox"]="www.google.com"
        self.br["textBox1"]='www.example.com'
        self.br["users[0].firstName"]="firstName"
        self.br["users[0].lastName"]="LastName"
        self.br["users[0].emailAddress"]="fname at example.com"
        print 'Submitting the form'
        resp=self.br.submit()
        self.html=resp.read()

def startThis(times,reqs):
    #print 'Threads ='+str(times)
    #print 'Reques/Thread ='+ str(maxReqs)

    threads=[]
    for i in range (0,reqs):
        owner=Requests(times)
        owner.start()
        threads.append(owner)

    for thread in threads:
        thread.join()

if __name__=="__main__":
    #I want to create 2 threads, each of them will execute twice. At
least that is the intention.
    startThis(2,2)