A detailed explanation of the handshake between the client and the server of python Socket, pythonsocket

A detailed explanation of the handshake between the client and the server of python Socket, pythonsocket

In simple learning, socket is used to establish a connection between the client and the server and send data.

1. Client socketClient. py code

Import socket s = socket. socket (socket. AF_INET, socket. SOCK_STREAM) # establish a connection: s. connect ('2017. 0.0.1 ', 9999) # receive the welcome message: print (s. recv (1, 1024 ). decode ('utf-8') for data in [B 'Michael', B 'Tracy', B 'Sarah']: # send data: s. send (data) print (s. recv (1, 1024 ). decode ('utf-8') s. send (B 'exit ') s. close ()

2. Server serverSocket. py code

Import socket import threading import time # from threading import Thread s = socket. socket (socket. AF_INET, socket. SOCK_STREAM) # listening port: s. bind ('2017. 0.0.1 ', 9999) s. listen (5) print ('Waiting for connection... ') def tcplink (sock, addr): print ('Accept new connection from % s: % s... '% addr) sock. send (B 'Welcome! ') While True: data = sock. recv (1024) time. sleep (1) if not data or data. decode ('utf-8') = 'eg': break sock. send ('hello, % s! '% Data. decode ('utf-8 ')). encode ('utf-8') sock. close () print ('Connection from % s: % s closed. '% addr) while True: # accept a new connection: sock, addr = s. accept () # create a new thread to process TCP connections: t = threading. thread (target = tcplink, args = (sock, addr) t. start ()

3. Operation Process

Open two console windows and run python3 serverSocket. py on the server first.

Then run the client python3 socketClient. py

The socket connection is as follows:

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