import threading, time


def doWaiting():
    print('start waiting:', time.strftime('%S'))
    time.sleep(3)
    print('stop waiting:', time.strftime('%S'))


thread1 = threading.Thread(target=doWaiting)
thread1.start()
time.sleep(1)  # 确保线程thread已经启动
print('start join')
thread1.join()  # 将一直堵塞，直到thread1运行结束
print('end join')