查看父进程id ，和子进程id

from multiprocessing import Process
import time
import 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__":
    t = Process(target=task, )
    t.start()
    print("主", os.getpid(), os.getppid())
主 30324 24252
29356 is running,parent id is <30324>
29356 is done,parent id is <30324>
24252 是pycharm pid 
30324 父进程  子进程29356