【プログラミング】Pythonにてクライアント～サーバ間のソケット通信を行う

import socket

def start_server(host='127.0.0.1', port=65432):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as server_socket:
        server_socket.bind((host, port))
        server_socket.listen()

        print(f'Server listening on {host}:{port}')

        # 接続待ち
        conn, addr = server_socket.accept()
        with conn:
            print(f'Connected by {addr}')
            
            # タイムアウト設定 (秒)
            conn.settimeout(10.0)
            
            try:
                while True:
                    data = conn.recv(1024)
                    if not data:
                        break
                    print(f'Received: {data.decode()}')
                    
                    # 受け取ったデータに対して応答
                    response = f'ACK: {data.decode()}'
                    conn.sendall(response.encode())
            except socket.timeout:
                print('Connection timed out')

if __name__ == "__main__":
    start_server()

import socket

def start_client(host='127.0.0.1', port=65432):
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as client_socket:
        client_socket.connect((host, port))
        
        # タイムアウト設定 (秒)
        client_socket.settimeout(10.0)
        
        try:
            message = 'Hello, Server!'
            print(f'Sending: {message}')
            client_socket.sendall(message.encode())
            
            # サーバーからの応答を受け取る
            data = client_socket.recv(1024)
            print(f'Received: {data.decode()}')
        except socket.timeout:
            print('Connection timed out')

if __name__ == "__main__":
    start_client()

Server listening on 127.0.0.1:65432

Sending: Hello, Server!
Received: ACK: Hello, Server!

Server listening on 127.0.0.1:65433
Connected by ('127.0.0.1', 55092)
Received: Hello, Server!