code: def __init__(self, *args: _t.Any, **kwargs: _t.Any) -> None:
      super().__init__(*args, **kwargs)
      warn(
          """
              Sentinel is not a public part of the traitlets API.
              It was published by mistake, and may be removed in the future.
              """,
          DeprecationWarning,
          stacklevel=2,
      )
  
file_path: catboost/contrib/python/traitlets/py3/traitlets/__init__.py
imports: import typing
  from .None import traitlets
  from ._version import __version__, version_info
  from .traitlets import *
  from .utils.bunch import Bunch
  from .utils.decorators import signature_has_traits
  from .utils.importstring import import_item
  from .utils.warnings import warn
label_desc: Use image node_id 1 to create a new Sentinel object from inherited base classes: traitlets with example: obj = Sentinel()