Echo Server in Python

echo_server.py

import socket

def server(host, port):

    sock = socket.socket()
    sock.bind((host, port))
    sock.listen(2)

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

    try:
        while True:
            conn, cliaddr = sock.accept()

            # Replace echo with something interesting
            echo(conn, cliaddr)

    finally:
        sock.close()


def echo(conn, cliaddr):
    file = conn.makefile()

    print(f'Received connection from {cliaddr}')

    try:
        while True:
            line = file.readline()
            if not line:
                print(f'Failed to get a line, try again')
                continue

            line = line.rstrip()
            if line == 'quit':
                conn.sendall(b'closing connection\r\n')
                break

            print(f'{cliaddr} -> {line}')
            conn.sendall(b'Echoed: %a\r\n' % line)

    finally:
        print(f'Closing up shop {cliaddr} quit')
        file.close()
        conn.close()

if __name__ == '__main__':

    server('0.0.0.0', 8080)

This is a simple TCP echo server in python. Replace the echo function with something more interesting and wrap it in a thread or process.