socket

　　

客户端
 1 #!/usr/bin/env python
#coding:utf-8

import socket

client = socket.socket()

ip_port=('127.0.0.1',9999)
client.connect(ip_port)

while True:
    data=client.recv(1024)#接收数据
    print data
    inp=raw_input('information:')#发送数据
    client.send(inp)
    if inp == 'exit':
        break

服务器端 
1 #!/usr/bin/env python
#coding:utf-8

import socket

sk = socket.socket()

ip_port=('127.0.0.1',9999)
sk.bind(ip_port)
sk.listen(5)

while True:
    conn,address = sk.accept()#返回值是元组,conn相当于一个会话标识
    conn.send('hello,world')
    flag=True
    while flag:
        data=conn.recv(1024)
        print data
        if data == 'exit':
            flag=False
        conn.send('sb')
    conn.close()