python通过线程实现定时器timer的方法
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2023-01-22 08:46:58
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...
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。