python 守护进程

守护进程，会随着主进程代码执行结束，而结束

# func1是死循环，如没有守护进程daemon会一直执行下去
# p1是守护进程，主进程的代码执行结束，p1结束
# 注意：在进程开始前，把进程变成守护进程 p.daemon = True
import time
from multiprocessing import Process


def func1():
    while 1:
        print('I want sleep')
        time.sleep(1)


def func2():
    time.sleep(8)
    print('I hate this country')


if __name__ == '__main__':
    p1 = Process(target=func1)
    p1.daemon = True
    p1.start()
    p2 = Process(target=func2)
    p2.start()
    for i in range(3):
        print('wait')
        time.sleep(2)
"""
结果：
wait
I want sleep
I want sleep
wait
I want sleep
I want sleep
wait
I want sleep
I want sleep
I hate this country
"""

"""
其它方法：
p.terminate()，中断进程
p.is_alive()，判断进程是否还活着
p.pid
p.name
"""