What does vote.vote refer to in this snippet? def txn(): quote = Quote.get_by_id(quote_id) vote = Vote.get_by_key_name(key_names = user.email(), parent = quote) if vote is None: vote = Vote(key_name = user.email(), parent = quote) if vote.vote == newvote: return quote.votesum = quote.votesum - vote.vote + newvote vote.vote = newvote from here: http://code.google.com/appengine/articles/overheard.html