code: def __getitem__(self, item):
      if item:
          logger.warning(
              "Ignoring name '%s' for single stage in '%s'.",
              item,
              self.dvcfile,
          )
      # during `load`, we remove attributes from stage data, so as to
      # not duplicate, therefore, for MappingView, we need to deepcopy.
      return self.load_stage(
          self.dvcfile, deepcopy(self.stage_data), self.stage_text
      )
  
imports: from collections.abc import Mapping
  from copy import deepcopy
  from itertools import chain
  from typing import TYPE_CHECKING, Any, Dict, Iterable, Optional, Tuple
  from funcy import get_in, lcat, once, project
  from dvc import dependency, output
  from dvc.log import logger
  from dvc.parsing import FOREACH_KWD, JOIN, MATRIX_KWD, EntryNotFound
  from dvc.utils.objects import cached_property
  from dvc_data.hashfile.meta import Meta
  from .None import PipelineStage, Stage, loads_from
  from .exceptions import StageNameUnspecified, StageNotFound
  from .params import StageParams
  from .utils import fill_stage_dependencies, resolve_paths
label_desc: Use image node_id 2 for calling the SingleStageLoader obj's underlying member method code with example usage: obj.__getitem__(item) and returns: self