python中实现定时器Timer

实现定时器最简单的办法是就是循环中间嵌time.sleep(seconds)， 这里我就不赘述了

# encoding: UTF-8
import threading
#Timer（定时器）是Thread的派生类，
#用于在指定时间后调用一个方法。
def func():print 'hello timer!'
timer = threading.Timer(5, func)
timer.start()

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 threading
def 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.py
hello world
hello world
hello 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 = secondsthreading.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.runTimefor sec in range(self.runTime):print countertime.sleep(1.0)counter -= 1print "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 = argsself.action = actionCountDownTimer.__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()