from multiprocessing import Process
import timedef work(n):time.sleep(n)print('守护进程。。。。。')if __name__ == '__main__':p = Process(target=work, args=(3,))p.daemon = Truep.start()# p.join()print('主进程内')# 输出结果：
# 主进程内
# 说明：子进程都没有执行到，因为主进程已经结束。

from multiprocessing import Process
import timedef work(n):time.sleep(n)print('守护进程。。。。。')pp1 = Process(target=time.sleep, args=(3,))pp1.start()if __name__ == '__main__':p = Process(target=work, args=(3,))p.daemon = Truep.start()p.join()print('主进程内')# 输出结果：
# 主进程内
# 说明：子进程都没有执行到，因为主进程已经结束。

守护进程。。。。。
Process Process-1:
Traceback (most recent call last):File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/multiprocessing/process.py", line 258, in _bootstrapself.run()File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/multiprocessing/process.py", line 93, in runself._target(*self._args, **self._kwargs)File "/data/bealla/work/luffy/projects/zuoye/network/test2.py", line 9, in workpp1.start()File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/multiprocessing/process.py", line 103, in start'daemonic processes are not allowed to have children'
AssertionError: daemonic processes are not allowed to have children
主进程内

from multiprocessing import Processimport time
def foo():print(123)time.sleep(1)print("end123")def bar():print(456)time.sleep(3)print("end456")if __name__ == '__main__':p1=Process(target=foo)p2=Process(target=bar)p1.daemon=Truep1.start()p2.start()print("main-------")

main-------
456
end456

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