import threading import time def music():     print("begin to listen %s" %time.ctime())     time.sleep(3)     print("stop to listen %s" %time.ctime()) def game():     print("begin to listen %s" % time.ctime())     time.sleep(5)     print("stop to listen1 %s" % time.ctime()) if __name__ =='__main__':     t1 = threading.Thread(target=music)     t2 = threading.Thread(target=game)     t1.start()     # t1.join()     t2.start()     # t1.join()     t2.join()     print("ending")    # l = []    #    #  for i in range(2):    #      threading.Thread(target=music)