Functional programing with python and django

gistfile1.py

    def __vote(self,user,up_or_down):
        if self.user is not user:
            votes = VoteQuestion.objects.filter(question=self,user=user)
            if len(votes)>0:
                vote = votes[0]
                if vote.score is up_or_down:
                    # el mismo voto
                    return -1
                else:
                    vote.score += up_or_down
                    vote.save()
                    #smell
                    if up_or_down is 1:
                        self.votes_up += 1
                    elif up_or_down is -1:
                        self.votes_down += 1
                    else:
                        raise ValueError("Bad argument, up_or_down must be 1 or -1")
                    self.save()
                    return 1
            else:
                VoteQuestion(question=self,user=user,score=up_or_down).save()
                #smell
                if up_or_down is 1:
                    self.votes_up += 1
                elif up_or_down is -1:
                    self.votes_down += 1
                else:
                    raise ValueError("Bad argument, up_or_down must be 1 or -1")
                self.save()
                return 1
        return -1
    
    vote_up = lambda self,user: self.__vote(user,1)
    vote_down = lambda self,user: self.__vote(user,-1)