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from threading import Thread

from time import sleep

class CountdownTask(object):

def __init__(self):

self._running = True

def terminate(self):

self._running = False

def run(self, n):

while self._running and n > 0: # 轮询退出状态，用于终止线程

print('T-minus', n)

n -= 1

sleep(5)

c = CountdownTask()

t = Thread(target=c.run, args=(10,))

t.start()

c.terminate()

t.join