def get_gradebook_column_admin_session_for_gradebook(self, gradebook_id=None):
if gradebook_id is None:<EOL><INDENT>raise NullArgument<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the ``OsidSession`` associated with the gradebook column admin service for the given gradebook.

        arg:    gradebook_id (osid.id.Id): the ``Id`` of the gradebook
        return: (osid.grading.GradebookColumnAdminSession) - ``a
                GradebookColumnAdminSession``
        raise:  NotFound - ``gradebook_id`` not found
        raise:  NullArgument - ``gradebook_id`` is ``null``
        raise:  OperationFailed - ``unable to complete request``
        raise:  Unimplemented - ``supports_gradebook_column_admin()`` or
                ``supports_visible_federation()`` is ``false``
        *compliance: optional -- This method must be implemented if
        ``supports_gradebook_column_admin()`` and
        ``supports_visible_federation()`` are ``true``.*