用Python編寫簡單的定時器的方法

 　　這篇文章主要介紹了用Python編寫簡單的定時器的方法,主要用到了Python中的threading模塊,需要的朋友可以參考下

　　下面介紹以threading模塊來實現定時器的方法。

　　首先介紹一個最簡單實現：

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1 2 3 4 5 6 7 8 9 10 import threading   def say_sth(str): print str t = threading.Timer(2.0, say_sth,[str]) t.start()   if __name__ == '__main__': timer = threading.Timer(2.0,say_sth,['i am here too.']) timer.start()

　　不清楚在某些特殊應用場景下有什麼缺陷否。

　　下面是所要介紹的定時器類的實現：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 class Timer(threading.Thread): """ very simple but useless timer. """ def __init__(self, seconds): self.runTime = seconds threading.Thread.__init__(self) def run(self): time.sleep(self.runTime) print "Buzzzz!! Time's up!"   class CountDownTimer(Timer): """ a timer that can counts down the seconds. """ def run(self): counter = self.runTime for sec in range(self.runTime): print counter time.sleep(1.0) counter -= 1 print "Done"   class CountDownExec(CountDownTimer): """ a timer that execute an action at the end of the timer run. """ def __init__(self, seconds, action, args=[]): self.args = args self.action = action CountDownTimer.__init__(self, seconds) def run(self): CountDownTimer.run(self) self.action(self.args)   def myAction(args=[]): print "Performing my action with args:" print args if __name__ == "__main__": t = CountDownExec(3, myAction, ["hello", "world"]) t.start()