将写内容过程较好的内容收藏起来，下面的内容内容是关于python通过线程实现定时器timer的的内容，希望对码农有较大帮助。

import threadingdef sayhello():        print "hello world"        global t        #Notice: use global variable!        t = threading.Timer(5.0, sayhello)        t.start()t = threading.Timer(5.0, sayhello)t.start()运行结果如下>python hello.pyhello worldhello worldhello world下面是定时器类的实现：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 argsif __name__ == "__main__":        t = CountDownExec(3, myAction, ["hello", "world"])        t.start()以上代码在Python2.5.4中运行通过