【Python】process 模块的其他方法

import time,os
from multiprocessing import Process

# Process.join()    等待子进程结束
# Process.start()   让子进程执行类里的run方法
# Process.terminate()  终止子进程
# Process.is_alive()  判断子进程是否存活


def run(name, second):  # 固定名字run, 会被start调用

    print(name, 'child <%s> is running, parent is <%s>' % (os.getpid(), os.getppid()))
    time.sleep(second)
    print(name, 'child <%s> is done, parent is <%s>' % (os.getpid(), os.getppid()))


if __name__ == '__main__':
    p1 = Process(target=run, kwargs={'name': 'p1', 'second': 3})
    p2 = Process(target=run, kwargs={'name': 'p2', 'second': 2})
    p3 = Process(target=run, kwargs={'name': 'p3', 'second': 1})
    p1.start()
    p2.start()
    p3.start()
    p1.join()
    p2.join()
    p3.join()
    print('child <%s> still exist ' % p1.pid)
    print('主进程<%s>, pycharm<%s>' % (os.getpid(), os.getppid()))