Python 无限循环

 import threading
 import time

 class CountDownTimer(threading.Thread):
         def __init__(self, seconds, action):
             self.runTime = seconds
             self.action = action
             super(CountDownTimer, self).__init__()

         def run(self):
             counter = self.runTime
             for sec in range(self.runTime):
                     print counter
                     time.sleep(1.0)
                     counter -=
             print " Time's up"
             self.action()

 def dosomethine():
     print "I'm ready"

     t = CountDownTimer(, dosomethine)
     t.start()
 if __name__ == "__main__":

     t = CountDownTimer(, dosomethine)
     t.start()