'''
import socket

# (1) 构建套接字对象，确定通信协议
sock = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
# (2) 绑定IP和端口
ip_port = ("127.0.0.1", 9999)
sock.bind(ip_port)
# (3) 监听最大排队数
sock.listen(2)
# (4) 阻塞等待客户端连接
while 1:
    print("server is waiting...")
    conn, addr = sock.accept()
    # print("conn", conn)
    # print("addr", addr)
    while 1:
        #  接受来自客户端的消息
        data = conn.recv(1024)  # recv是一个阻塞函数
        print("data",data,type(data))
        if data == b"" or data == b"q":
            break
        print("接受来自客户端的消息：", data.decode())
        # 给给客户端发送消息：注意 send发送的字节
        conn.send(data.decode().upper().encode())
'''

'''
import socket

# (1) 构建套接字对象，确定通信协议
sock = socket.socket(family=socket.AF_INET, type=socket.SOCK_STREAM)
ip_port = ("127.0.0.1", 9999)
sock.connect(ip_port)

while 1:
    # 客户端给服务端发送消息
    data = input("请输入:")
    sock.send(data.encode())
    if data == "q":
        break
    data = sock.recv(1024)
    print("服务端响应消息：", data.decode())
'''