python 如何设置守护进程

# encoding: utf-8
"""
author: yangyi@youzan.com
time: 2019/7/30 11:20 AM
func:
"""
from multiprocessing import Process
import os
import time

def now():
  return str(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime()))

def func_1(name):
  print(now() + ' Run child process %s ,pid is %s...' % (name, os.getpid()))
  time.sleep(2)
  print(now() + ' Stop child process %s ,pid is %s...' % (name, os.getpid()))


def func_2(name):
  print(now() + ' Run child process %s , pid is %s...' % (name, os.getpid()))
  time.sleep(4)
  print(now() + ' hello world!')
  print(now() + ' Stop child process %s , pid is %s...' % (name, os.getpid()))


if __name__ == '__main__':
  print ('Parent process %s.' % os.getpid())
  p1 = Process(target=func_1, args=('func_1',))
  p2 = Process(target=func_2, args=('func_2',))
  print now() + ' Process start.'
  p1.daemon = True #设置子进程p1为守护线程
  p1.start()
  p2.start()
  print now() + ' Process end .'

if __name__ == '__main__':
  print ('Parent process %s.' % os.getpid())
  p1 = Process(target=func_1, args=('func_1',))
  p2 = Process(target=func_2, args=('func_2',))
  print now() + ' Process start.'
  p2.daemon = True #设置子进程p2为守护线程
  p1.start()
  p2.start()
  print now() + ' Process end .'