PID

Windows系统下的进程PID

from multiprocessing import Process
import time, os
def task():
    print('%s is running,parent id is <%s>' % (os.getpid(), os.getppid()))
    time.sleep(3)
    print('%s is done,parent id is <%s>' % (os.getpid(), os.getppid()))
if __name__ == '__main__':
    p = Process(target=task, )
    p.start()
    print('主', os.getpid(), os.getppid())

观察：父进程执行完后，父进程等待子进程执行完，程序才结束。