Create the list of unfollowers on Twitter using Python

unfollowers.py

import twitter

# Twitter username
SCREEN_NAME = 'VVVVVVVV'

# Consumer API keys
CONSUMER_KEY = 'WWWWWWWW'
CONSUMER_SECRET = 'XXXXXXXX'

# Access token & access token secret
ACCESS_TOKEN = 'YYYYYYYY'
ACCESS_TOKEN_SECRET = 'ZZZZZZZZ'

# Create an Api instance.
api = twitter.Api(consumer_key=CONSUMER_KEY,
                  consumer_secret=CONSUMER_SECRET,
                  access_token_key=ACCESS_TOKEN,
                  access_token_secret=ACCESS_TOKEN_SECRET,
                  sleep_on_rate_limit=True)

# Retrieve the list of followers IDs
followers_ids = api.GetFriendIDs()

# Retrieve the list of following IDs
following_ids = api.GetFollowerIDs()

# Extract the list of followings who don't follow
unfollowers_ids = list(set(followers_ids) - set(following_ids))

# Add users to the list for manual review
api.CreateListsMember(slug='unfollowers',
                      user_id=unfollowers_ids,
                      owner_screen_name=SCREEN_NAME)