PythonのsocketモジュールでHello, world!

client1.py

"""
socketモジュールを使ってHello, World
"""
import socket

bind_address = '127.0.0.1'
bind_port = 7777


def main():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM,)
    print("Start connect {}:{}".format(bind_address, bind_port))
    sock.connect((bind_address, bind_port))
    received = sock.recv(1024)
    print(received.decode('utf8'))
    sock.send(b"My name is Spam!")
    sock.close()


if __name__ == '__main__':
    main()

server1.py

"""
socketモジュールを使ってHello, World
"""
import socket
import os

bind_address = '127.0.0.1'
bind_port = 7777


def main():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind((bind_address, bind_port))
    sock.listen(1)
    # os.fork()  # 待ち受けるプロセスを増やす場合はここでforkすればいい
    print("Start listen {}:{}".format(bind_address, bind_port))
    while True:
        conn, (address, client_port) = sock.accept()
        print("Connect from: {}, {}".format(address, client_port))
        conn.send(b"Hello, World!")
        message = conn.recv(1024)
        try:
            print("[{}] {}".format(client_port, message.decode('utf8')))
            conn.close()
        except Exception:
            pass


if __name__ == '__main__':
    main()