tcp/socket

import socket

server = socket.socket()
server.bind(("localhost", 6969))        #绑定要监听的端口
server.listen(2)     #监听多少个连接

while True:
    conn,addr=server.accept()           #等待数据
    #conn就是客户端连过来而在服务器端围棋生成的一个连接实例
    print(conn)
    print(addr)
    # server.accept()
    while True:
        data = conn.recv(1024)
        if data is None:
            print("connection lost")
            break
        print("recv", data)
        print(type(data))
        conn.send(data.upper())

server.close()

import socket

client = socket.socket()         #生命socket类型,生成socket连接对象
client.connect((‘localhost‘, 6969))
while True:
        msg = input("type here >>").strip()
        if len(msg) == 0:
                continue
        client.send(msg.encode(‘utf-8‘)),       # 不能send空

        data = client.recv(1024)

        print(data.decode())

client.close()