python中实现定时器Timer
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python中实现定时器Timer
小編覺得挺不錯(cuò)的,現(xiàn)在分享給大家,幫大家做個(gè)參考.
實(shí)現(xiàn)定時(shí)器最簡(jiǎn)單的辦法是就是循環(huán)中間嵌time.sleep(seconds), 這里我就不贅述了
# encoding: UTF-8 import threading #Timer(定時(shí)器)是Thread的派生類, #用于在指定時(shí)間后調(diào)用一個(gè)方法。 def func():print 'hello timer!' timer = threading.Timer(5, func) timer.start()本文實(shí)例講述了python通過線程實(shí)現(xiàn)定時(shí)器timer的方法。分享給大家供大家參考。具體分析如下:
這個(gè)python類實(shí)現(xiàn)了一個(gè)定時(shí)器效果,調(diào)用非常簡(jiǎn)單,可以讓系統(tǒng)定時(shí)執(zhí)行指定的函數(shù)
下面介紹以threading模塊來實(shí)現(xiàn)定時(shí)器的方法。
使用前先做一個(gè)簡(jiǎn)單試驗(yàn):
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()運(yùn)行結(jié)果如下:
>python hello.py hello world hello world hello world下面是定時(shí)器類的實(shí)現(xiàn):
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()轉(zhuǎn)載于:https://www.cnblogs.com/eurekahmily/p/5330921.html
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