import threading import time #继承 class threading.Thread class MyThread(threading.Thread):     #类做初始化     def __init__(self,name):         #调用hreading.Thread.__init__(self)方法         threading.Thread.__init__(self)         self.name=name     # 把要执行的代码写到run函数里面 线程在创建后会直接运行run函数     def run(self):         print_time(self.name) def print_time(name):     if name=="Thread1":         for i in range(3):             print("Thread1 Star"+time.ctime(time.time()))             time.sleep(2)             print("Thread1"+time.ctime(time.time()))             print("Thread1 End" + time.ctime(time.time()))     else:         for i in range(3):             print("Thread2 Star"+time.ctime(time.time()))             time.sleep(5)             print("Thread2"+time.ctime(time.time()))             print("Thread2 End" + time.ctime(time.time())) #创建线程 t1=MyThread("Thread1") t2=MyThread("Thread2") #启动线程 t1.start() t2.start() #守护进程，直到子线程结束 t1.join() t2.join()