python中是通過套接字即socket來實(shí)現(xiàn)UDP及TCP通信的。有兩種套接字面向連接的及無連接的，也就是TCP套接字及UDP套接字。

TCP通信模型

創(chuàng)建TCP服務(wù)器

偽代碼：

ss = socket() # 創(chuàng)建服務(wù)器套接字ss.bind() # 套接字與地址綁定ss.listen() # 監(jiān)聽連接inf_loop: # 服務(wù)器無限循環(huán) cs = ss.accept() # 接受客戶端連接 comm_loop: # 通信循環(huán)  cs.recv()/cs.send() # 對話（接收/發(fā)送） cs.close() # 關(guān)閉客戶端套接字ss.close() # 關(guān)閉服務(wù)器套接字#（可選）

TCP時(shí)間戳服務(wù)器：

import socketfrom time import ctimeHOST = ''PORT = 8099BUFSIZE = 1024ADDR = (HOST, PORT)tcpSerSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)tcpSerSock.bind(ADDR)tcpSerSock.listen(5)while True: print("等待連接......") tcpCliSock, addr = tcpSerSock.accept() print("...接收到連接：", addr) while True:  data = tcpSerSock.recv(BUFSIZE)  if not data:   break  tcpCliSock.send('[%s] %s' % (bytes(ctime(), 'utf-8'), data)) tcpCliSock.close()tcpSerSock.close()

創(chuàng)建TCP客戶端：

偽代碼:

cs = socket() # 創(chuàng)建客戶端套接字cs.connect() # 嘗試連接服務(wù)器comm_loop: # 通信循環(huán) cs.send() / cs.recv() # 對話（發(fā)送/接收）cs.close() # 關(guān)閉客戶端套接字 

TCP時(shí)間戳客戶端：

import socketHOST = 'localhost'PORT = 8099BUFSIZE = 1024ADDR = (HOST, PORT)tcpCliSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)tcpCliSock.connect(ADDR)while True: data = input("> ") if not data:  break tcpCliSock.send(data) data = tcpCliSock.recv(BUFSIZE) if not data:  break print(data)tcpCliSock.close()

UDP通信模型

創(chuàng)建UDP服務(wù)器

偽代碼：

ss = socket() # 創(chuàng)建服務(wù)器套接字ss.bind() # 綁定服務(wù)器套接字inf_loop: # 服務(wù)器無限循環(huán) cs = ss.recvfrom()/ss.sendto() # 關(guān)閉（接收/發(fā)送）ss.close() # 關(guān)閉服務(wù)器套接字

UDP時(shí)間戳服務(wù)器：

import socketfrom time import ctimeHOST = ''PORT = 8099BUFSIZE = 1024ADDR = (HOST, PORT)udpSerSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)udpSerSock.bind(ADDR)while True: print("等待連接......") data, addr = udpSerSock.recvfrom(BUFSIZE) udpSerSock.sendto('[%s] %s' % (ctime(), data), addr) print("...接收到連接：", addr)udpSerSock.close()

創(chuàng)建UDP客戶端

偽代碼：

cs = socket() # 創(chuàng)建客戶端套接字comm_loop: # 通信循環(huán) cs.sendto() / cs.recvfrom() # 對話（發(fā)送/接收）cs.close() # 關(guān)閉客戶端套接字

UDP時(shí)間戳客戶端：

import socketHOST = 'localhost'PORT = 8099BUFSIZE = 1024ADDR = (HOST, PORT)udpCliSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)udpCliSock.connect(ADDR)while True: data = input("> ") if not data:  break udpCliSock.sendto(data, ADDR) data, ADDR = udpCliSock.recvfrom(BUFSIZE) if not data:  break print(data)udpCliSock.close()