code: def get_or_create_data_group(self, title: str) -> DataGroup:
          
          return DataGroup(self.__document_controller.document_model.get_or_create_data_group(title))
docs: Get (or create) a data group.
  
          .. versionadded:: 1.0
          .. deprecated:: 1.1
             Use :py:meth:`~nion.swift.Facade.Library.create_data_item_from_data` instead.
  
          Scriptable: No