class_docstr: provide attribute-style access to a nested dict
code: def __getattr__(self, key: str):
      prefix = object.__getattribute__(self, "prefix")
      if prefix:
          prefix += "."
      prefix += key
      try:
          v = object.__getattribute__(self, "d")[key]
      except KeyError as err:
          raise OptionError("No such option") from err
      if isinstance(v, dict):
          return DictWrapper(v, prefix)
      else:
          return _get_option(prefix)
  
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 3 for calling the DictWrapper obj's underlying member method code with example usage: obj.__getattr__(key) and returns: DictWrapper, _get_option