import socket

 sk1 = socket.socket()

 sk1.bind(('127.0.0.1',8001,))

 sk1.listen()

 inputs = [sk1,]

 import select

 while True:

     # [sk1,sk2,sk3]select内部自动监听sk1,sk2,sk3,三个对象，一旦某个句柄发生变化（accept（））

     # 如果有链接sk1

     # r_list = [sk1,sk2]

     r_list,w_list,e_list = select.select(inputs,[],inputs,1)

     print('正在监听的socket对象%d' % len(inputs))

     print(r_list)

     for sk1_or_conn in r_list:

         # 每一个链接对象

         if sk1_or_conn ==sk1:

             # 表示有新用户链接

             conn,adress = sk1_or_conn.accept()

             inputs.append(conn)#添加客户端文件句柄到列表

         else:

             # 表示有老用户来链接

             try:

                 data_bytes = sk1_or_conn.recv(1024)

                 data_str = str(data_bytes,encoding='utf-8')

                 sk1_or_conn.sendall(bytes(data_str+'好',encoding='utf-8'))

             except Exception as e:

                 inputs.remove(sk1_or_conn)

 import socket

 obj = socket.socket()

 obj.connect(('127.0.0.1',8001,))

 while True:

     inp = input('请如入内容：')

     obj.sendall(bytes(inp,encoding='utf-8'))

     rec_bytes = obj.recv(1024)

     rec_str = str(rec_bytes,encoding='utf-8')

     print(rec_str)