Twitter diff followers

#!/usr/bin/python
# -*- coding: utf-8 -*-

# INSTALL Tweepy library before launching the script

import tweepy
import sys

USERNAME1 = "FIXME_user1"
followers1 = []
USERNAME2 = "FIXME_user2"
followers2 = []
USERNAME3 = "FIXME_user3"
followers3 = []

def GetFollowers(Username, Result):
    try:

        twitter_user = tweepy.api.get_user(Username)
        cursor_followers = tweepy.Cursor(tweepy.api.followers, id = Username)

        print "Récupération des followers de " + Username

        compteur = 0
        max_follow = twitter_user.followers_count
        temp = 0
        for followe in cursor_followers.items():
            compteur += 1
            pourcentage = (compteur * 100) / max_follow
            if (pourcentage % 5 == 0) & (temp != pourcentage):
                print "\r" + str(pourcentage) + "% effectué",
                sys.stdout.flush()
                temp = pourcentage
            Result.append(followe.screen_name)

    except tweepy.error.TweepError as e:
        print "ERROR: " +  str(e)


GetFollowers(USERNAME1, followers1)

GetFollowers(USERNAME2, followers2)

GetFollowers(USERNAME3, followers3)

res1 = list(set(followers1) & set(followers2))
res2 = list(set(res1) & set(followers3))

for follow in res2:
    print follow