#!/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); #監聽8個客戶端；   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();