重点总结：

服务端：一直运行（while true），监听运行所在机器（ip）某端口，多线程或多进程接收客户端的socket请求

客户端：主动发起请求，需求知道服务器的ip和端口

服务端：

# -*- coding:utf-8 -*-
import time
import socket
import threading
def tcplink(sock, addr):
    print ‘Accept new connection from %s:%s...‘ % addr
    sock.send(‘Welcome!‘)
    while True:
        data = http://www.mamicode.com/sock.recv(1024)
        time.sleep(1)
        if data =http://www.mamicode.com/= ‘exit‘ or not data:
            break
        sock.send(‘Hello, %s!‘ % data)
    sock.close()
    print ‘Connection from %s:%s closed.‘ % addr


s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((‘127.0.0.1‘, 9999))
s.listen(5)
print ‘Waiting for connection...‘
while True:
    # 接受一个新连接:
    time.sleep(5)
    print ‘sdasdasd‘
    sock, addr = s.accept()
    print sock
    print addr
    # 创建新线程来处理TCP连接:
    t = threading.Thread(target=tcplink, args=(sock, addr))
    t.start()

客户端：

# -*- coding:utf-8 -*-
import time
import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 建立连接:
s.connect((‘127.0.0.1‘, 9999))
# 接收欢迎消息:
print s.recv(1024)
for data in [‘Michael‘, ‘Tracy‘, ‘Sarah‘]:
    # 发送数据:
    s.send(data)
    print s.recv(1024)
s.send(‘exit‘)
s.close()

python---tcp/ip网络编程