code: def get(self, object_id):
          
          if not object_id:
              raise LeanCloudError(code=101, error='Object not found.')
          obj = self._query_class.create_without_data(object_id)
          obj.fetch(select=self._select, include=self._include)
          return obj
docs: 根据 objectId 查询。
  
          :param object_id: 要查询对象的 objectId
          :return: 查询结果
          :rtype: Object