Python 2 vs. 3 about ps239t HOT 6 CLOSED

"""
String Substitution for a Mad Lib
Adapted from code by Kirby Urner
"""                                                  

story = """                                       
Once upon a time, deep in an ancient jungle,
there lived a %(animal)s.  This %(animal)s
liked to eat %(food)s, but the jungle had
very little %(food)s to offer.  One day, an
explorer found the %(animal)s and discovered
it liked %(food)s.  The explorer took the
%(animal)s back to %(city)s, where it could
eat as much %(food)s as it wanted.  However,
the %(animal)s became homesick, so the
explorer brought it back to the jungle,
leaving a large supply of %(food)s.

The End
"""                                                 

def tellStory():                                     
    userPicks = dict()                              
    addPick('animal', userPicks)            
    addPick('food', userPicks)            
    addPick('city', userPicks)            
    print(story % userPicks)                        

def addPick(cue, dictionary):
    prompt = "Enter a specific example for %s: " % cue     
    dictionary[cue] = input(prompt)                                                             

tellStory()                                         
input("Press Enter to end the program.")