python定时器timer_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 = 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()