The Pipe pipe in the Python multiprocessing module USES the instance

multiprocessing.Pipe([duplex])
Returns two connection objects (conn1, conn2), representing both ends of the pipe, and the default is two-way communication. If duplex=False,conn1 can only be used to receive messages and conn2 can only be used to send messages

Examples are as follows:

#!/usr/bin/python

#coding=utf-8

import os

from multiprocessing import Process, Pipe
def send(pipe):

    pipe.send(['spam'] + [42, 'egg'])

    pipe.close()
def talk(pipe):

    pipe.send(dict(name = 'Bob', spam = 42))

    reply = pipe.recv()

    print('talker got:', reply)
if __name__ == '__main__':

    (con1, con2) = Pipe()

    sender = Process(target = send, name = 'send', args = (con1, ))

    sender.start()

    print "con2 got: %s" % con2.recv()# from send Messages are received 

    con2.close()
    (parentEnd, childEnd) = Pipe()

    child = Process(target = talk, name = 'talk', args = (childEnd,))

    child.start()

    print('parent got:', parentEnd.recv())

    parentEnd.send({x * 2 for x in 'spam'})

    child.join()

    print('parent exit')

The output is as follows:

con2 got: ['spam', 42, 'egg']

('parent got:', {'name': 'Bob', 'spam': 42})

('talker got:', set(['ss', 'aa', 'pp', 'mm']))

parent exit