code: def columns_classes(self):
          '''returns columns count'''
          md = 12 / self.objects_per_row
          sm = None
          if self.objects_per_row > 2:
              sm = 12 / (self.objects_per_row / 2)
          return md, (sm or md), 1f columns_classes(self):
          '''returns columns count'''
          md = 12 / self.objects_per_row
          sm = None
          if self.objects_per_row > 2:
              sm = 12 / (self.objects_per_row / 2)
          return md, (sm or md), 12
docs: returns columns count