code: def get_or_create_data_group(self, title: str) -> DataGroup:
          
          return DataGroup(self.__document_model.get_or_create_data_group(title))
docs: Get (or create) a data group.
  
          :param title: The title of the data group.
          :return: The new :py:class:`nion.swift.Facade.DataGroup` object.
          :rtype: :py:class:`nion.swift.Facade.DataGroup`
  
          .. versionadded:: 1.0
  
          Scriptable: Yes