'''多线程-继承方式'''import threadingimport timeclass Hello(threading.Thread):    def __init__(self,args):        super(Hello,self).__init__()        self.args = args    #必须重写run方法    def run(self):        print("开始子进程{0}".format(self.args))        time.sleep(1)        print("结束子进程{0}".format(self.args))if __name__ == '__main__':    print("start main")    t1 = Hello(1)    t2 = Hello(2)    t1.start()    t2.start()    print("end main")