docstr: return section names as a list
code: def section_names(cls) -> list[str]:
      """return section names as a list"""
      return [
          c.__name__
          for c in reversed(cls.__mro__)
          if issubclass(c, Configurable) and issubclass(cls, c)
      ]
  
imports: from __future__ import annotations
  import logging
  import typing
  from copy import deepcopy
  from textwrap import dedent
  from traitlets.traitlets import Any, Container, Dict, HasTraits, Instance, TraitType, default, observe, observe_compat, validate
  from traitlets.utils import warnings
  from traitlets.utils.bunch import Bunch
  from traitlets.utils.text import indent, wrap_paragraphs
  from .loader import Config, DeferredConfig, LazyConfigValue, _is_section_key
label_desc: Use image node_id 2 for calling the Configurable obj's underlying member method code with example usage: obj.section_names(cls) and returns: unknown