docstr: return section names as a list
docstr_tok: ["return","section","names","as","a","list"]
code: def section_names(cls):
      """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 print_function, absolute_import
  from copy import deepcopy
  import warnings
  from .loader import Config, LazyConfigValue, _is_section_key
  from traitlets.traitlets import HasTraits, Instance, observe, observe_compat, default
  from ipython_genutils.text import indent, dedent, wrap_paragraphs
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