server

import socket
ip_port=('127.0.0.1',8080);
back_log=5
buffer_size=1024

serv=socket.socket(socket.AF_INET,socket.SOCK_STREAM);

serv.bind(ip_port)

serv.listen(back_log)
print('服务端开始打印了')
conn,addr=serv.accept() #  开始卡数

print('双向连接',conn)
print('客户端地址',addr)

while True:
    data=conn.recv(buffer_size)

    print('客户端发来的消息是',data.decode('utf-8'))

    conn.send((data.upper()))

conn.close()

serv.close()

client
import socket;
ip_port=('127.0.0.1',8080);
buffer_size=1024
client_tcp=socket.socket(socket.AF_INET,socket.SOCK_STREAM);
client_tcp.connect(ip_port)

while True:
    msg=input('>>:').strip()
    client_tcp.send(msg.encode('utf-8'))

    print('客户端已经发送效益')

    data=client_tcp.recv(buffer_size)

    print('收到服务端发来的消息',data.decode('utf-8'))

client_tcp.close();