code: def get_assessment_offered_bank_assignment_session(self, proxy):
          
          if not self.supports_assessment_offered_bank_assignment():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.AssessmentOfferedBankAssignmentSession(proxy=proxy, runtime=self._runtime)
docs: Gets the session for assigning offered assessments to bank mappings.
  
          arg:    proxy (osid.proxy.Proxy): a proxy
          return: (osid.assessment.AssessmentOfferedBankAssignmentSession)
                  - an ``AssessmentOfferedBankAssignmentSession``
          raise:  NullArgument - ``proxy`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented -
                  ``supports_assessment_offered_bank_assignment()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_assessment_offered_bank_assignment()`` is ``true``.*