docs: def get_assessment_part_bank_session(self):
          """Gets the ``OsidSession`` to lookup assessment part/bank mappings for assessment parts.
  
          return: (osid.assessment.authoring.AssessmentPartBankSession) -
                  an ``AssessmentPartBankSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - ``supports_assessment_part_bank()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_assessment_part_bank()`` is ``true``.*
  
          """
          if not self.supports_assessment_part_bank():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.AssessmentPartBankSession(runtime=self._runtime)