@abc.abstractmethod<EOL><INDENT>def get_assessment_bank_assignment_session(self):<DEDENT>
return<EOL>
Gets the ``OsidSession`` associated with the assessment bank assignment service.

        :return: an ``AssessmentBankAssignmentSession``
        :rtype: ``osid.assessment.AssessmentBankAssignmentSession``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``Unimplemented`` -- ``supports_assessment_bank_assignment()`` is ``false``

        *compliance: optional -- This method must be implemented if
        ``supports_assessment_bank_assignment()`` is ``true``.*