class_docstr: provide attribute-style access to a nested dict
code: def __dir__(self) -> list[str]:
      return list(self.d.keys())
  
imports: from __future__ import annotations
  from contextlib import ContextDecorator, contextmanager
  import re
  from typing import TYPE_CHECKING, Any, Callable, Generic, NamedTuple, cast
  import warnings
  from pandas._typing import F, T
  from pandas.util._exceptions import find_stack_level
label_desc: Use image node_id 4 for calling the DictWrapper obj's underlying member method code with example usage: obj.__dir__() and returns: list