python通过线程实现定时器timer

2023-01-31 01:01:19 python 线程 定时器
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()
 
 
#该代码片段来自于: Http://www.sharejs.com/codes/python/8815
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()
 
 
 
#该代码片段来自于: http://www.sharejs.com/codes/python/8815
以上代码在Python 2.5.4中运行通过
以上代码在Python 2.5.4中运行通过

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