Domain to IP Address

#!/usr/bin/python3
# python3 dotoip.py list.txt
# list without http://
# source : https://github.com/dextercyberlab/Domain-to-IP-Converter
import socket
d = []

def domaintoip(file):
    with open(file) as t:
        for Hostname in t:
            Hostname = Hostname.rstrip()
            try:
                s = socket.gethostbyname(Hostname)
                d.append(s)
                print(Hostname + ' ===> ' + s)
            except:
                print(Hostname, 'Not Valid')
                continue


    with open('output.txt', 'w') as output:
        for out in d:
            print(out, file=output)
        output.close()

f = str(input('Enter the file you want to extract: '))
domaintoip(f)