def get_activity_objective_bank_assignment_session(self):
if not self.supports_activity_objective_bank_assignment():<EOL><INDENT>raise Unimplemented()<EOL><DEDENT>try:<EOL><INDENT>from . import sessions<EOL><DEDENT>except ImportError:<EOL><INDENT>raise OperationFailed()<EOL><DEDENT>try:<EOL><INDENT>session = sessions.ActivityObjectiveBankAssignmentSession(runtime=self._runtime)<EOL><DEDENT>except AttributeError:<EOL><INDENT>raise OperationFailed()<EOL><DEDENT>return session<EOL>
Gets the session for assigning activity to objective bank
        mappings.

        return: (osid.learning.ActivityObjectiveBankAssignmentSession) -
                an ActivityObjectiveBankAssignmentSession
        raise:  OperationFailed - unable to complete request
        raise:  Unimplemented -
                supports_activity_objective_bank_assignment() is false
        compliance: optional - This method must be implemented if
                    supports_activity_objective_bank_assignment() is
                    true.