docs: def get_objective_objective_bank_assignment_session(self):
          """Gets the session for assigning objective to objective bank mappings.
  
          return: (osid.learning.ObjectiveObjectiveBankAssignmentSession)
                  - an ``ObjectiveObjectiveBankAssignmentSession``
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented -
                  ``supports_objective_objective_bank_assignment()`` is
                  ``false``
          *compliance: optional -- This method must be implemented if
          ``supports_objective_objective_bank_assignment()`` is ``true``.*
  
          """
          if not self.supports_objective_objective_bank_assignment():
              raise errors.Unimplemented()
          # pylint: disable=no-member
          return sessions.ObjectiveObjectiveBankAssignmentSession(runtime=self._runtime)