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from threading import Thread

from time import time, sleep

def countdown(n):

while n > 0:

print('T-minus', n)

n -= 1

sleep(3)

t = Thread(target=countdown, args=(10,))

t.daemon = True # 设置为守护进程

t.start()

while True:

if t.is_alive(): # 查询进程是否在运行

print('still running') #

sleep(3)

break # 主线程准备退出，因为仅有的子线程时守护线程，所以主线程就直接退出了