Twitter Heathens: Find people you follow who don't follow you back

heathens.py

# By twitter.com/j4mie
#
# Like this: http://blog.davidziegler.net/post/107429458/see-which-twitterers-don-t-follow-you-back-in-less-than
#  ..but with API pagination (in case you have more than 100 friends or followers).
# Needs this: http://code.google.com/p/python-twitter/
#  ..which needs this: http://cheeseshop.python.org/pypi/simplejson

import twitter, getpass, sys

def page_function(function):
	page = 1
	all_results = []
	while(True):
		results_for_page = function(page=page)
		if len(results_for_page) == 0:
			break
		all_results.extend(results_for_page)
		page = page + 1
	return all_results
	
def get_heathens(username, password):
	print 'Finding heathens...'
	
	api = twitter.Api(username, password)
	friends = set([friend.screen_name for friend in page_function(api.GetFriends)])
	followers = set([follower.screen_name for follower in page_function(api.GetFollowers)])
	
	heathens = friends - followers
	print "There are %i people you follow who do not follow you:" % len(heathens)
	
	heathens = list(heathens)
	heathens.sort(key=lambda x: str(x).lower())

	for heathen in heathens:
		print heathen
		
if __name__ == "__main__":
	try:
		get_heathens(sys.argv[1], getpass.getpass())
	except Exception, error:
		print 'Something went wrong:', error.message
		sys.exit()