python通过线程实现定时器timer

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

>python hello.py

hello world

hello world

hello world

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