'Validates that the id passed in exists in mailchimp.'

def handle(self, *args, **options):

    (key, web_id) = self.parse_options(options)
    mailchimp = MailSnake(key)
    lists = mailchimp.lists()['data']
    by_web_id = {l['web_id']: l for l in lists}
    list_with_id = by_web_id.get(web_id, None)
    if list_with_id:
        print 'id:    {}    for    web_id:    {}'.format(list_with_id['id'], web_id)
        print 'list    name:    {}'.format(list_with_id['name'])
    else:
        print 'list    with    web_id:    {}    not    found.'.format(web_id)
        sys.exit(1)
