Python socket programming

This article mainly introduces the relevant information of Python network programming in detail. Python socket programming has certain reference value. Interested friends can refer to it

Python provides two level of access to network services.

The low-level network service supports basic Socket, which provides the standard BSD Sockets API and can access all methods of the underlying operating system Socket interface.
High-level network service module SocketServer, which provides server center classes that can simplify the development of network servers.

What is Socket?

Socket is also called "socket". Applications usually send requests to or respond to the network through "socket" Requests enable communication between hosts or between processes on a computer.

socket() function

In Python, we use the socket() function to create a socket. The syntax format is as follows:

socket.socket ([family[, type[, proto]]])

Parameters

family: The socket family can be AF_UNIX or AF_INET
type: The socket type can be Depending on whether it is connection-oriented or non-connection, it is divided into SOCK_STREAM or SOCK_DGRAM
protocol: Generally, if not filled in, the default is 0.

socket realizes simple communication between the server and the client (simulating ssh Some functions and automatic responses)

Simple program example on the server side:

#!/usr/bin/env python
#coding:utf-8
'''
file:server.py
date:9/8/17 3:43 PM
author:lockey
email:lockey@123.com
desc:socket编程服务器端，python3.6.2
'''
import re
import socket,time,os
s = socket.socket()   # 创建 socket 对象
host = '127.0.0.1'#socket.gethostname() # 获取本地主机名
port = 9999    # 设置端口
s.bind((host, port))  # 绑定端口
s.listen(5)     # 等待客户端连接
while True:
 conn, addr = s.accept()  # 建立客户端连接。
 print('conneted address:'.decode('utf-8'), addr)#显示连接到服务器的客户端的地址
 while True:
  data = conn.recv(1024)
  #接收到的客户端的请求或者返回
  if not data:
  #当返回信息为空或者请求为空时断开客户端连接
   print('Connection closed!')
   break;
 data = data.decode('utf-8')
 #以下前三个条件都是设置的自动检测应答，最后一个是根据输入的内容进行的命令执行，并将结果返回给客户端
  if re.findall(r'who',data):
   reply = 'I am lockey'.encode('utf-8')
  elif re.findall(r'gender',data):
   reply = 'A boy'.encode('utf-8')
  elif re.findall(r'age',data):
   reply = '23'.encode('utf-8')
  else:
   print('execute com:',data)
   cmd_res = os.popen(data).read()
   if not cmd_res:
   #对于命令的执行如果没有返回值的话就给客户端发送一条信息
    conn.send('No response'.encode('utf-8'))
    continue
   reply = cmd_res.encode('utf-8')
 conn.send(reply)
 #将结果发送给客户端

Simple implementation on the client side:

#!/usr/bin/env python
#coding:utf-8
'''
file:client.py
date:9/8/17 3:43 PM
author:lockey
email:lockey@123.com
desc:socket编程客户端，python3.6.2
'''
import socket,time    # 导入 socket 模块

s = socket.socket()   # 创建 socket 对象
host = '127.0.0.1'#socket.gethostname() # 获取本地主机名
port = 9999    # 设置端口好

s.connect((host, port))
while True:
 cmd = input("lockey#")
 #用户输入
 if len(cmd) == 0:continue
 #如果用户未输入内容则继续下一次输入
 s.send(cmd.encode('utf-8'))
 #将用户输入的内容发送给客户端等待结果
 result = s.recv(1024)
 if not result:
 #如果服务端没有返回结果则继续下一次输入
  continue
 print(result.decode('utf-8'))
 #如果服务端有返回则打印结果
s.close()
#用户终止程序时关闭连接

Server-side running results

Client-side running screenshot

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