docs: def get_assessment_part_item_session(self, proxy):
          """Gets the ``OsidSession`` associated with the assessment part item service.
  
          return: (osid.assessment.authoring.AssessmentPartItemSession)
                  - an ``AssessmentPartItemSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_assessment_part_item()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_assessment_part_lookup()`` is ``true``.*
  
          """
          if not self.supports_assessment_part_lookup():  # This is kludgy, but only until Tom fixes spec
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.AssessmentPartItemSession(proxy=proxy, runtime=self._runtime)