Someone

import socket
import sys

socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

host = ""
port = 20000

socket.bind((host, port))
socket.listen(1)
x = 0
clientsocket, clientaddress = socket.accept()
print clientaddress
data = socket.recv(4)
data = 2 * data
clientsocket.send(data)
clientsocket.close()