Python 网络编程 （一）

1、socket() 模块函数

创建套接字语法：

  socket(socket_family,  socket_type,  protocol = 0)  socket_family 用 AF_INET 表示网络连接  socket_type 是 SOCKET_STREAM (为创建 TCP 套接字)或 SOCKET_DGRAM（为创建 UDP 套接字）  protocol 通常省略，默认是 0

为创建 TCP／IP 连接 ，可以用以下方式
tcpSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

为创建 UDP／IP 连接，可以用以下方式
udpSock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

2、套接字对象（内置）方法

3、创建 TCP 服务端

from socket import *from time import ctimehost = ''port = 8433address = (host, port)bufsize = 1024tcpServer = socket(AF_INET, SOCK_STREAM)tcpServer.bind(address)tcpServer.listen()while True:    print('waiting for connection ...')    tcpCliSock, Addr = tcpServer.accept()    print('connected from:', Addr)    while True:        data = tcpCliSock.recv(bufsize)        if not data:            break        tcpCliSock.send(ctime().encode('utf-8'))    tcpCliSock.close()tcpServer.close()

4、创建 TCP 客户端

from socket import *from time import ctimehost = 'localhost'port = 8433address = (host, port)bufsize = 1024tcpClient = socket(AF_INET, SOCK_STREAM)tcpClient.connect(address)while True:    print('client is connecting')    data = '324242'    tcpClient.send(data.encode('utf-8'))    data = tcpClient.recv(bufsize)    if not data:        break;    print(data.decode('utf-8'))tcpClient.close()

5、创建 UDP 服务端

from socket import *from time import ctimehost = ''port = 3528address = (host, port)bufsize = 1024udpSoc = socket(AF_INET, SOCK_DGRAM)udpSoc.bind(address)while True:    print('udpServer start ')    udpSockServer, addr =  udpSoc.recvfrom(bufsize)    print('udpServer add : ', addr)    udpSoc.sendto(ctime().encode('utf-8'), addr)udpSoc.close()

6、创建 UDP 客户端

from time import ctimefrom socket import *host = 'localhost'port = 3528address = (host, port)bufsize = 1024udpSocClient = socket(AF_INET, SOCK_DGRAM)while True:    print('udpClient start')    udpSocClient.sendto('dadasda'.encode('utf-8'), address)    data, addr = udpSocClient.recvfrom(bufsize)    if not data:        break    print(data)udpSocClient.close()