docstr: Get the config section for this class.
  
  Parameters
  ----------
  classes : list, optional
      The list of other classes in the config file.
      Used to reduce redundant information.
code: def class_config_section(
      cls, classes: t.Sequence[type[HasTraits]] | None = None
  ) -> str:
      """Get the config section for this class.
  
      Parameters
      ----------
      classes : list, optional
          The list of other classes in the config file.
          Used to reduce redundant information.
      """
  
      def c(s: str) -> str:
          """return a commented, wrapped block."""
          s = "\n\n".join(wrap_paragraphs(s, 78))
  
          return "## " + s.replace("\n", "\n#  ")
  
      # section header
      breaker = "#" + "-" * 78
      parent_classes = ", ".join(
          p.__name__
          for p in cls.__bases__
          if issubclass(p, Configurable)
      )
  
      s = f"# {cls.__name__}({parent_classes}) configuration"
      lines = [breaker, s, breaker]
      # get the description trait
      desc = cls.class_traits().get("description")
      if desc:
          desc = desc.default_value
      if not desc:
          # no description from trait, use __doc__
          desc = getattr(cls, "__doc__", "")  # type:ignore[arg-type]
      if desc:
          lines.append(c(desc))  # type:ignore[arg-type]
          lines.append("")
  
      for name, trait in sorted(cls.class_traits(config=True).items()):
          default_repr = trait.default_value_repr()
  
          if classes:
              defining_class = cls._defining_class(trait, classes)
          else:
              defining_class = cls
          if defining_class is cls:
              # cls owns the trait, show full help
              if trait.help:
                  lines.append(c(trait.help))
              if "Enum" in type(trait).__name__:
                  # include Enum choices
                  lines.append("#  Choices: %s" % trait.info())
              lines.append("#  Default: %s" % default_repr)
          else:
              # Trait appears multiple times and isn't defined here.
              # Truncate help to first line + "See also Original.trait"
              if trait.help:
                  lines.append(c(trait.help.split("\n", 1)[0]))
              lines.append(
                  f"#  See also: {defining_class.__name__}.{name}"
              )
  
          lines.append(f"# c.{cls.__name__}.{name} = {default_repr}")
          lines.append("")
      return "\n".join(lines)
  
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 11 for calling the Configurable obj's underlying member method code with example usage: obj.class_config_section(cls, classes) and returns: str, unknown