#!/usr/bin/env python 
# -*- coding: utf-8 -*- 
 
import socket 
import threading 
import time 
 
def tcplink(sock, addr): 
  print('Accept new connection from %s:%s...' % addr); 
  sock.send(b'Welcome!!!'); 
  while True: 
    data = sock.recv(1024); 
    time.sleep(1); 
    if not data or data.decode('utf-8') == 'exit': 
       break; 
    sock.send(b'Hello, %s!' % data); 
  sock.close(); 
  print('Connection from %s:%s closed.' % addr); 
 
 
if __name__ == "__main__": 
 
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM); 
 
  s.bind(('127.0.0.1', 9090)); 
  s.listen(8); #监听8个客户端； 
  print('waiting for connection...'); 
 
  while True: 
    sock, addr = s.accept(); 
    t = threading.Thread(target=tcplink, args=(sock,addr)); 
    t.start(); 

#!/usr/bin/env python 
# -*- coding: utf-8 -*- 
 
import socket 
 
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM); 
s.connect(('127.0.0.1', 9090)); 
print(s.recv(1024).decode('utf-8')); 
for data in [b'lk', b'aa', b'bb']: 
  s.send(data); 
  print(s.recv(1024).decode('utf-8')); 
s.send(b'exit'); 
s.close();