code: def _get_by_key(self, key, handle_not_found=True):
          
          resolution = self._get_item_or_section(key, handle_not_found=handle_not_found)
          if self.settings.key_getter:
              return self.settings.key_getter(parent=self, subject=resolution)
          else:
              return resolution
docs: This method must NOT be called from outside the Section class.
  
          Do not override this method.