python通过线程实现定时器timer的源码
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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Python2.5.4中运行通过
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