@abc.abstractmethod<EOL><INDENT>def get_gradebook_column(self):<DEDENT>
return<EOL>
Gets the ``GradebookColumn``.

        :return: the ``GradebookColumn``
        :rtype: ``osid.grading.GradebookColumn``
        :raise: ``OperationFailed`` -- unable to complete request

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