for tw_list in list_urls:
    # Split list url into relavant pieces
    user = tw_list.split('/')[1]
    list_name = tw_list.split('/')[3]

    # Using Tweepy api, getting json of all users in list
    list_members_output = api.list_members(user, list_name)

    # Parsing json data and appending to appropriate lists instantiated above
    for user_id in list_members_output:
        users_list.append(user_id._json['id'])
        bios_list.append(user_id._json['screen_name'])
        desc_list.append(user_id._json['description'])
        follower_count_list.append(user_id._json['followers_count'])