本文实例讲述了python通过线程实现定时器timer的方法。分享给大家供大家参考。具体分析如下：

这个python类实现了一个定时器效果，调用非常简单，可以让系统定时执行指定的函数

下面介绍以threading模块来实现定时器的方法。

使用前先做一个简单试验：

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Python 2.5.4中运行通过

希望本文所述对大家的Python程序设计有所帮助。