Python-сообщество

   
class MyManager(models.Manager):
    def tut(self, x=0, y=0):
        all_summ = None
        if x == 1:
            all_summ = F('price_1') * y
        elif x == 2:
            all_summ = (F('price_1') + F('price_2')) * y
        elif x == 3:
            all_summ = (F('price_1') + F('price_2') + F('price_3')) * y
        return super().get_queryset().filter(max_size__gte=x).annotate(my_s=all_summ)