#!/usr/bin/python

 import socket

 import threading

 import time

 def tcplink(sock, addr):

     print 'accept new connection from %s:%s...' % addr

     sock.send('welcome to hahaha!')

     while True:

         data = sock.recv(1024)

         time.sleep(1)

         if data == 'exit' or not data:

             break

         print 'recv msg: %s from %s' % (data,addr)

         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(('0.0.0.0',9999))

 s.listen(5)

 print 'waiting for connection...'

 while True:

     sock, addr = s.accept()

     tt = threading.Thread(target=tcplink,args=(sock,addr))

     tt.start()

 #!/usr/bin/python

 import socket

 s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

 s.connect(('127.0.0.1',9999))

 print 'recv msg:%s' % s.recv(1024)

 while True:

     data = raw_input('input sth:')

     if not data:

         continue

     if data == 'exit':

         break

     s.send(data)

     print 'recv msg:%s' % s.recv(1024)

 s.close()