code: def __getitem__(self, key: int | str) -> RenderRoot:
      if isinstance(key, int):
          (root, elementid) = list(self._roots.items())[key]
      else:
          for root, elementid in self._roots.items():
              if root.name == key:
                  break
          else:
              raise ValueError(f"root with {key!r} name not found")
  
      return RenderRoot(elementid, root.id, root.name, root.tags)
  
imports: from __future__ import annotations
  import logging
  import re
  from contextlib import contextmanager
  from typing import TYPE_CHECKING, Any, Iterator, Sequence
  from weakref import WeakKeyDictionary
  from ..core.types import ID
  from ..document.document import Document
  from ..model import Model, collect_models
  from ..settings import settings
  from ..themes.theme import Theme
  from ..util.dataclasses import dataclass, field
  from ..util.serialization import make_globally_unique_css_safe_id, make_globally_unique_id
label_desc: Use image node_id 4 for calling the RenderRoots obj's underlying member method code with example usage: obj.__getitem__(key) and returns: RenderRoot