服务端

import socket

sk1 = socket.socket()

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

sk1.listen()

sk2 = socket.socket()

sk2.bind(('127.0.0.1',8002))

sk2.listen()

sk3 = socket.socket()

sk3.bind(('127.0.0.1',8003))

sk3.listen()

inp = [sk1,]

import select

while True:

    print(len(inp))

    #r_list 接收inp参数  如果有用户来链接 它就会感知到，

    #w_list 可以写固定句柄 进行监听 如果 [sk1,sk3]

    #e_list 监听发生错误的句柄,如果有把就把它移除掉， 如下面for循环

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

    for i in r_list:

        # print(i,'\n',sk1.accept())

        if i == sk1:

            # print(i.accept(),'\n',sk1.accept())

            conn,address = i.accept()

            inp.append(conn)

            print(inp)

        else:

            try:

                str(conn.recv(1024),encoding='utf-8')

                conn.sendall(bytes('hello',encoding='utf-8'))

            except Exception as e:

                inp.remove(i)

客户端

import socket

obj = socket.socket()

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

inp = input('')

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

r = str(obj.recv(1024),encoding='utf-8')

print(r)