class_docstr: Base class used to display multiple child widgets.
class_docstr_tok: ["Base","class","used","to","display","multiple","child","widgets","."]
code: def _repr_keys(self):
      # We also need to include _titles in repr for reproducibility
      for key in super(_SelectionContainer, self)._repr_keys():
          yield key
      if self._titles:
          yield "_titles"
  
file_path: catboost/contrib/python/ipywidgets/py2/ipywidgets/widgets/widget_selectioncontainer.py
imports: from .widget_box import Box
  from .widget import register
  from .widget_core import CoreWidget
  from traitlets import Unicode, Dict, CInt, TraitError, validate
  from ipython_genutils.py3compat import unicode_type
label_desc: Use image node_id 4 for calling the _SelectionContainer obj's underlying member method code with example usage: obj._repr_keys() without return types