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本文实例讲述了Python简单网络编程。分享给大家供大家参考，具体如下：
内容目录
1. 客户端（client.py） 2. 服务端（server.py）
一、客户端（client.py）
? 1 2 3 4 5 6 7 8 9 10 11import socket
import sys
port = 70
host = sys.argv[1]
filename = sys.argv[2]
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
fd = s.makefile("rw", 0)
fd.write(filename + "n")
for line in fd.readlines():
sys.stdout.write(line)
程序通过socket.socket()建立一个Socket，参数告诉系统需要一个Internet Socket进行TCP通信。接着程序链接远程的主机名，并提供文件名。最后获得响应后在屏幕上打印出来。
测试
? 1python client.py quux.org /
显示
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32iWelcome to gopher at quux.org! fake (NULL) 0
i fake (NULL) 0
iThis server has a lot of information of historic interest, fake (NULL) 0
ifunny, or just plain entertaining -- all presented in Gopher. fake (NULL) 0
iThere are many mirrors here of rare or valuable files with the fake (NULL) 0
iaim to preserve them in case their host disappears. PLEASE READ fake (NULL) 0
i"About This Server" FOR IMPORTANT NOTES AND LEGAL INFORMATION. fake (NULL) 0
i fake (NULL) 0
0About This Server /About This Server.txt gopher.quux.org 70 +
1Archives /Archives gopher.quux.org 70 +
1Books /Books gopher.quux.org 70 +
1Communication /Communication gopher.quux.org 70 +
iThis directory contains the entire text of the book fake (NULL) 0
i"We the Media: Grassroots Journalism by the People, for the People" fake (NULL) 0
iby Dan Gillmor in various formats. fake (NULL) 0
i fake (NULL) 0
iFeel free to download and enjoy. fake (NULL) 0
1Computers /Computers gopher.quux.org 70 +
1Current Issues and Events (Updated Apr. 23, 2002) /Current gopher.quux.org 70 +
1Development Projects /devel gopher.quux.org 70 +
0Gopher's 10th Anniversary /3.0.0.txt gopher.quux.org 70
1Government, Politics, Law, and Conflict /Government gopher.quux.org 70 +
0How To Help /How To Help.txt gopher.quux.org 70 +
1Humor and Fun /Humor and Fun gopher.quux.org 70 +
1Index to Quux.Org /Archives/index gopher.quux.org 70
1Internet /Internet gopher.quux.org 70 +
1Other Gopher Servers /Software/Gopher/servers gopher.quux.org 70
1People /People gopher.quux.org 70 +
1Reference /Reference gopher.quux.org 70 +
1Software and Downloads /Software gopher.quux.org 70 +
1The Gopher Project /Software/Gopher gopher.quux.org 70
0What's New /whatsnew.txt gopher.quux.org 70 +
二、服务端（server.py）
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18# coding: utf-8
import socket
host = ''
port = 51421
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind((host, port))
s.listen(1) #每次最多只有一个等候处理
print "Server is running on port %d; press Ctrl-C to terminate." %port
while 1:
clientsock, clientaddr = s.accept()
clientfile = clientsock.makefile('rw', 0)
clientfile.write("Welcome, " + str(clientaddr) + "n")
clientfile.write("Please enter a string: ")
line = clientfile.readline().strip()
clientfile.write("You entered %d characters. n" %len(line))
clientfile.close()
clientsock.close()
建立一个socket，设置成可复用的（reusable），绑定端口号51421（可选大于1024的任一值），调用listen（）函数，开始等待来自客户端的请求，同时设定最多只有一个等候处理的链接。
主循环对a.accept（）函数调用开始，程序连接一个客户端后立马停止，接收用户的输入。
运行一个例子
首先运行server.py
? 1python server.py
另开一个终端，连接localhost的51421端口。
? 1 2 3 4 5 6 7 8jihite@ubuntu:~/web$ telnet localhost 51421
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Welcome, ('127.0.0.1', 59853)
Please enter a string: mm
You entered 2 characters.
Connection closed by foreign host.
希望本文所述对大家Python程序设计有所帮助。