def get_grade_system_smart_gradebook_session(self, gradebook_id=None, proxy=None):
if proxy is None:<EOL><INDENT>raise NullArgument()<EOL><DEDENT>raise Unimplemented()<EOL>
Gets the session for managing smart gradebooks of grade systems.

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