python通过线程实现定时器timer的方法

本文实例讲述了python/' target='_blank'>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。