Python's way to implement timer timer via thread _python

The example in this article describes the way Python implements timer timer by thread. Share to everyone for your reference. The specific analysis is as follows:

This Python class implements a timer effect, which is simple enough to allow the system to perform a specified function at timed intervals.

Here's how to implement the timer with the threading module.

Do a simple experiment before using:

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 ()

The results of the operation are as follows:

>python hello.py Hello World Hello World

The following is the implementation of the Timer class:

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 a action at the end of the timer run. "" "Def __init__ (self, Seconds, action, args=[]): Self.args = args self.action = Action Countd Owntimer.__init__ (self, seconds) def run (self): Countdowntimer.run (self) self.action (Self.args) def my Action (args=[]): print "Performing my action with args:" Print args if __name__ = = "__main__": t = countdownexec (3, myaction, ["Hello", "World"]) T.start () 

The above code runs through the Python 2.5.4.

I hope this article will help you with your Python programming.