import threading,time
 
class Timer(threading.Thread):
    def __init__(self,fn,args=(),sleep=0,lastDo=True):
        threading.Thread.__init__(self)
        self.fn = fn
        self.args = args
        self.sleep = sleep
        self.lastDo = lastDo
        self.setDaemon(True)
         
        self.isPlay = True
        self.fnPlay = False
     
    def __do(self):
        self.fnPlay = True
        apply(self.fn,self.args)
        self.fnPlay = False
     
    def run(self):
        while self.isPlay:
            time.sleep(self.sleep)
            self.__do()
     
    def stop(self):
        #stop the loop
        self.isPlay = False
        while True:
            if not self.fnPlay:
                break
            time.sleep(0.01)
        #if lastDo,do it again
        if self.lastDo:
            self.__do()