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thread1已经启动
print('start join')
thread1.join() 								#将一直堵塞，直到thread1运行结束。
print('end join')
