@abc.abstractmethod<EOL><INDENT>def get_assessment_part(self, assessment_part_id):<DEDENT>
return<EOL>
Gets the ``AssessmentPart`` specified by its ``Id``.

        :param assessment_part_id: the ``Id`` of the ``AssessmentPart`` to retrieve
        :type assessment_part_id: ``osid.id.Id``
        :return: the returned ``AssessmentPart``
        :rtype: ``osid.assessment.authoring.AssessmentPart``
        :raise: ``NotFound`` -- no ``AssessmentPart`` found with the given ``Id``
        :raise: ``NullArgument`` -- ``assessment_part_id`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

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