#!/usr/bin/env python# -*- coding: utf-8 -*-from threading import Threadimport timedef run_thread(n):    for i in range(n):        print i        class race(Thread):    def __init__(self,threadname,interval):        Thread.__init__(self,name=threadname)        self.interval = interval        self.isrunning = True    def run(self):        while self.isrunning:            print ‘thread %s is running,time:%s\n‘ %(self.getName(),time.ctime())            time.sleep(self.interval)    def stop(self):        self.isrunning = Falsedef test():    t1 = Thread(target=run_thread,args=(5,))    t1.start()        thread1 = race(‘A‘,1)    thread2 = race(‘B‘,2)    thread1.start()    thread2.start()    time.sleep(4)    thread1.stop()    thread2.stop()if __name__ == ‘__main__‘:    test()