def get_string(self, key):
        raise NotImplementedError('Method must be implemented by subclass')
Renders the history view.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/Mailbox.get_string--crossover with--dataset/ETHPy150Open etianen/django-reversion/src/reversion/admin.py/VersionAdmin.history_view