Selectively unfollow people who don't follow you on twitter with gruesome and gory confirmation

unfollow.py

import time
import sys
import tweepy

consumer_key = ""
consumer_secret = ""
key = ""
secret = ""

auth = tweepy.OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(key, secret)

api = tweepy.API(auth_handler=auth)

followers_ids = set(api.followers_ids())
friends_ids = set(api.friends_ids())

non_friends = friends_ids.difference(followers_ids)

for i in non_friends:
    u = api.get_user(i)
    print "unfollow", u.name, u.screen_name
    answer = raw_input("Are you sure? [Y/n] ").lower()
    if answer and answer[0] != "y":
        continue
    else:
        u.unfollow()