总体的编程思想和unix socket差不多，下面仅给出tcp server、tcp client、udp server、udp client的例子。

tcp server：

#!/usr/bin/env python

from socket import *
from time import ctime

HOST = ''
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerSock.bind(ADDR)
tcpSerSock.listen(5)

while True:
    print 'waiting for connection...'
    tcpCliSock, addr = tcpSerSock.accept()
    print '...connected from:', addr

    while True:
        data = tcpCliSock.recv(BUFSIZ)
        if not data:
            break
        tcpCliSock.send('[%s] %s' % (
            ctime(), data))

    tcpCliSock.close()
tcpSerSock.close()

tcp client：

#!/usr/bin/env python

from socket import *

HOST = 'localhost'
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

tcpCliSock = socket(AF_INET, SOCK_STREAM)
tcpCliSock.connect(ADDR)

while True:
    data = raw_input('> ')
    if not data:
        break
    tcpCliSock.send(data)
    data = tcpCliSock.recv(BUFSIZ)
    if not data:
        break
    print data

tcpCliSock.close()

udp server：

#!/usr/bin/env python

from socket import *
from time import ctime

HOST = ''
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

udpSerSock = socket(AF_INET, SOCK_DGRAM)
udpSerSock.bind(ADDR)

while True:
    print 'waiting for message...'
    data, addr = udpSerSock.recvfrom(BUFSIZ)
    udpSerSock.sendto('[%s] %s' % (
        ctime(), data), addr)
    print '...received from and returned to:', addr

udpSerSock.close()

udp client：

#!/usr/bin/env python

from socket import *

HOST = 'localhost'
PORT = 21567
BUFSIZ = 1024
ADDR = (HOST, PORT)

udpCliSock = socket(AF_INET, SOCK_DGRAM)

while True:
    data = raw_input('> ')
    if not data:
        break
    udpCliSock.sendto(data, ADDR)
    data, ADDR = udpCliSock.recvfrom(BUFSIZ)
    if not data:
        break
    print data

udpCliSock.close()

SocketServer模块，实际上是对socket tcp和udp的再一次封装，使用起来会比较简单

tcp server：

#!/usr/bin/env python

from SocketServer import (TCPServer as TCP,
    StreamRequestHandler as SRH)
from time import ctime

HOST = ''
PORT = 21567
ADDR = (HOST, PORT)

class MyRequestHandler(SRH):
    def handle(self):
        print '...connected from:', self.client_address
        self.wfile.write('[%s] %s' % (ctime(),
	    self.rfile.readline()))

tcpServ = TCP(ADDR, MyRequestHandler)
print 'waiting for connection...'
tcpServ.serve_forever()