Obtener IP desde una lista de URL Con python

get_ip_with_url.py

import socket

f = open("urls.txt")
num_line = sum(1 for line in f)
f.close()

with open("urls.txt", "r") as ins:
    array = []
    for line in ins:
        print socket.gethostbyname(line.strip())

En las urls.txt pondriamos algo como:
www.google.com
www.laurlquequieras.com