Gets the ``GradebookColumn``.

        return: (osid.grading.GradebookColumn) - the ``GradebookColumn``
        raise:  OperationFailed - unable to complete request
        *compliance: mandatory -- This method must be implemented.*

def get_gradebook_column(self):
        """Gets the ``GradebookColumn``.

        return: (osid.grading.GradebookColumn) - the ``GradebookColumn``
        raise:  OperationFailed - unable to complete request
        *compliance: mandatory -- This method must be implemented.*

        """
        # Implemented from template for osid.learning.Activity.get_objective
        if not bool(self._my_map['gradebookColumnId']):
            raise errors.IllegalState('gradebook_column empty')
        mgr = self._get_provider_manager('GRADING')
        if not mgr.supports_gradebook_column_lookup():
            raise errors.OperationFailed('Grading does not support GradebookColumn lookup')
        lookup_session = mgr.get_gradebook_column_lookup_session(proxy=getattr(self, "_proxy", None))
        lookup_session.use_federated_gradebook_view()
        return lookup_session.get_gradebook_column(self.get_gradebook_column_id())