Terminate a multi-thread python program

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How to make a multi-thread python program response to Ctrl+C key event?

Edit: The code is like this:

import threading
current = 0

class MyThread(threading.Thread):
    def __init__(self, total):
        threading.Thread.__init__(self)
        self.total = total

    def stop(self):
        self._Thread__stop()

    def run(self):
        global current
        while current<self.total:
            lock = threading.Lock()
            lock.acquire()
            current+=1
            lock.release()
            print current

if __name__=='__main__':

    threads = []
    thread_count = 10
    total = 10000
    for i in range(0, thread_count):
        t = MyThread(total)
        t.setDaemon(True)
        threads.append(t)
    for i in range(0, thread_count):
        threads[i].start()

I tried to remove join() on all threads but it still doesn't work. Is it because the lock segment inside each thread's run() procedure?

Edit: The above code is supposed to work but it always interrupted when current variable was in 5,000-6,000 range and through out the errors as below

Exception in thread Thread-4 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in __bootstrap_inner
  File "test.py", line 20, in run
<type 'exceptions.TypeError'>: unsupported operand type(s) for +=: 'NoneType' and 'int'
Exception in thread Thread-2 (most likely raised during interpreter shutdown):
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in __bootstrap_inner
  File "test.py", line 22, in run
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