twitterscript.py

# requires http://code.google.com/p/python-twitter/
import twitter
api = twitter.Api(username='yourusername', password='apassword')


def getAllFriends(username):
  myuser = api.GetUser(username)
  howmany = myuser.GetFriendsCount()
  mylist = []
  while(len(mylist)<howmany):
    mylist += api.GetFriends(myuser.screen_name, len(mylist)-1)
  return [u.screen_name for u in mylist]

if __name__=="__main__":
 user1=getAllFriends("username1")
 user2=getAllFriends("username2")
 intersection = list(set(user1) & set(user2))
 print [u for u in intersection]