Pipe pipe in the Python multiprocessing module

Multiprocessing. Pipe ([duplex])

Returns 2 Connection objects (CONN1, conn2), which represent both ends of the pipeline, and the default is two-way communication. If DUPLEX=FALSE,CONN1 can only be used to receive messages, CONN2 can only be used to send messages. Unlike Os.open, where Os.pipe () Returns 2 file descriptors (R, W) representing both readable and writable

Examples are as follows:

#!/usr/bin/python

#coding =utf-8

Import OS

From multiprocessing import Process, Pipe

def send (pipe):

Pipe.send ([' spam ') + [[] [' 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 () #从send收到消息

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 ', A, ' egg ']

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

(' Talker Got: ', set ([' SS ', ' AA ', ' pp ', ' mm '])

Parent exit

Codego.net code excerpt.

Pipe pipe in the Python multiprocessing module