python 进程 Pipe

from multiprocessing  import Process,Pipe

def f(conn):
    conn.send([42,None,"Hello"])
    print(conn.recv())
    print("I m fine ,parent")
    conn.close()
if __name__=="__main__":
    parent_conn,child_conn=Pipe()
    p=Process(target=f,args=(child_conn,))
    p.start()
    print(parent_conn.recv())
    parent_conn.send("Hello,child")
    p.join()