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()