def add(self, message):
        raise NotImplementedError('Method must be implemented by subclass')
Part of iteration protocol
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/Mailbox.add--crossover with--dataset/ETHPy150Open deontologician/restnavigator/restnavigator/halnav.py/HALNavigatorBase.__iter__