code: def _to_dict(self):
          
          _dict = {}
          if hasattr(self, 'cell_id') and self.cell_id is not None:
              _dict['cell_id'] = self.cell_id
          if hasattr(self, 'location') and self.location is not None:
              _dict['location'] = self.location._to_dict()
          if hasattr(self, 'text') and self.text is not None:
              _dict['text'] = self.text
          return _dict
docs: Return a json dictionary representing this model.