code: def get(self, type_name, obj_id, base_fields=None, nested_fields=None):
          
          base_fields = self.get_fields(type_name, base_fields, nested_fields)
          url = '/api/instances/{}/{}'.format(type_name, obj_id)
          return self.rest_get(url, fields=base_fields)
docs: Get the resource by resource id.
  
          :param nested_fields: nested resource fields.
          :param type_name: Resource type. For example, pool, lun, nasServer.
          :param obj_id: Resource id
          :param base_fields: Resource fields to return
          :return: List of tuple [(name, res_inst)]