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()
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。