hostname.py

#!/usr/bin/python3

import socket
import sys

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = ('0.0.0.0', 10000)
sock.bind(server_address)
sock.listen(1)

while True:
    connection, client_address = sock.accept()
    try:
        while True:
            data = connection.recv(16)
            if data:
                connection.sendall(socket.gethostname().encode())
            else:
                break
    finally:
        connection.close()