@abc.abstractmethod<EOL><INDENT>def get_gradebook_ids_by_gradebook_column(self, gradebook_column_id):<DEDENT>
return<EOL>
Gets the list of ``Gradebook``  ``Ids`` mapped to a ``GradebookColumn``.

        :param gradebook_column_id: ``Id`` of a ``GradebookColumn``
        :type gradebook_column_id: ``osid.id.Id``
        :return: list of gradebook ``Ids``
        :rtype: ``osid.id.IdList``
        :raise: ``NotFound`` -- ``gradebook_column_id`` is not found
        :raise: ``NullArgument`` -- ``gradebook_column_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*