服务器端代码:

# -*- coding: cp936 -*-import socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)#初始化socket sock.bind(("127.0.0.1", 8001))#绑定本机地址，8001端口sock.listen(5)#等待客户连接 while True: print "waiting client connection..." connection,address = sock.accept()#接收客户连接请求 print "a client have connected..." while True: try: connection.settimeout(5) #设置超时时间 buf = connection.recv(1024) #接收数据 if buf == "1": connection.send("you have send me 1!welcome to server!") elif buf=="2": connection.send("you have send me 2!I have recv!") elif buf=="3": connection.send("close the connection!") break else: connection.send("unknow command!") except socket.timeout: print "time out" connection.close() print "a client exit..."

客户器端代码：

import socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect(("127.0.0.1", 8001)) import time time.sleep(2)while True: data=raw_input("input command:"); sock.send(data) print sock.recv(1024) if data=="3": breaksock.close()

1.首先开两个IDLE，分别打开服务器端和客户器端代码。
2.F5运行服务器端代码，会出现waiting client connection...
3.F5运行客户端代码，会出现input command: ；
4.这时服务器和客户端就连接上了，可以正常的通信啦，如图：

5.再次运行服务器端代码时会出现错误，这时可以通过任务管理器，将其中的pythonw.exe进程结束，重新打开，编译就可以啦！

客户端：

import sockets=socket.socket()host = socket.gethostname()port = 1234s.connect((host, port))print s.recv(1024)

服务端：

import sockets = socket.socket()host = socket.gethostname()port = 1234s.bind((host, port)) s.listen(5)while True: c, addr = s.accept() print 'Got connection from', addr c.send('Thank you for connecting') c.close()

http编程

from urllib import urlopenwebpage = urlopen('http://www.python.org')

加上正规表达式

import retext = webpage.read()m = re.search('<a href="([^"]+)" .*?>about</a>', text, re.IGNORECASE)m.group(1)

urllib
urllib2

一个基于SocketServer的小型服务器例子：

from SocketServer import TCPServer, StreamRequestHandler>>> class Handler(StreamRequestHandler): def handle(self): addr = self.request.getpeername() print 'Got connection from', addr self.wfile.write('Thank you for connecting') >>> server = TCPServer(('',1234), Handler)>>> server.serve_forever()

使用SocketServer进行分叉和线程处理
分叉Server:

from SocketServer import TCPServer,ForkingMinIn, StreamRequestHandlerclass Server(ForkingMinIn, TCPServer):passclass Handler(StreamRequestHandler): def handle(self): addr = self.request.getpeername() print 'Got connection from',addr self.wfile.write('Thank you for connection')server = Server(('',1234),Handler)server.serve_forever()

线程Server:

from SocketServer import TCPServer, ThreadingMixIn, StreamRequestHandlerclass Server(ThreadingMixIn, TCPServer):passclass Handler(StreamRequestHandler): def handle(self): addr = self.request.getpeername() print 'Got connection from',addr self.wfile.write('Thank you for connecting')server = Server(('',1234),Handler)server.serve_forever()

带有select和pool的异步I/O
select服务：

import socket, selects = socket.socket()host = socket.gethostname()prot = 1234s.bind((host,port)) s.listen(5)inputs = [s]while True: rs,ws,es = select.select(inputs,[],[]) for r in rs: if r is s: c, addr = s.accept() print 'Got connection from',addr inputs.append(c) else: try: data = r.recv(1024) disconnected = not data except socket.error: disconnected = True if disconnected: print r.getpeername(), 'disconnected' inputs.remove(r) else: print data

pool服务器：

import socket, selects = socket.socket()host = socket.gethostname()port = 1234s.bind((host, port)) fdmap = {s.fileno():s} s.listen(5)p = select.poll()p.register(s)while True: events = p.poll() for fd, event in events: if fd in fdmap: c, addr = s.accept() print 'Got connection from', addr p.register(c) fdmap[c.fileno()]=c elif event & select.POLLIN: data = fdmap[fd].recv(1024) if not data: print fdmap[fd].getpeername(),'disconnected' p.unregister(fd) del fdmap[fd] else: print data

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