初学socket实现自己和自己说话

import socket
sk = socket.socket()
sk.bind(('127.0.0.1',8080))
sk.listen()

conn,addr = sk.accept()
while True:
    ret = conn.recv(1024).decode('utf-8')
    if ret == 'bye':
        break
    print(ret)
    info = input('>>>')
    conn.send(bytes(info,encoding='utf-8'))
conn.close()
sk.close()

server

import socket
sk = socket.socket()
sk.connect(('127.0.0.1',8080))
while True:
    info = input('>>>')
    sk.send(bytes(info,encoding='utf-8'))
    ret = sk.recv(1024).decode('utf-8')
    print(ret)
    if ret =='bye':
        sk.send(b'bye')
        break
sk.close()

client