Python-Twitter friends vs followers

from twitter import *
 
username='someuser'
password='somepwd'
 
api=twitter.Api()
api=twitter.Api(username,password)
 
friends = api.GetFriends()
friends_screen_names = [u.screen_name for u in friends]
 
followers = api.GetFollowers()
followers_screen_names = [u.screen_name for u in followers]
 
for u in friends_screen_names:
	if u not in followers_screen_names:
		print "%s is not following you" % (u)