1. 主进程或等待子进程执行完
# 输出over后主进程内容已经执行完了,但是会等待子进程执行完
from multiprocessing import *
from time import *

def print_info():
    for i in range(10):
        print(i)
        sleep(0.2)

if __name__ == '__main__':
    p = Process(target=print_info)
    p.start()
    sleep(0.5)
    print('over')
  1. 主进程强制子进程结束或直接结束程序
from multiprocessing import *
from time import *

def print_info():
    for i in range(10):
        print(i)
        sleep(0.2)

if __name__ == '__main__':
    p = Process(target=print_info)
    # 把子进程设置为守护进程,主进程结束时子进程直接销毁
    # p.daemon = True
    p.start()
    sleep(0.5)
    # 退出主程序前先让子进程销毁
    p.terminate()
    print('over')