Class NotSelfDisplaying

tests/test_formatters.py:471–476

            catcher.append(self)

    class NotSelfDisplaying(object):
        def __repr__(self):
            return "NotSelfDisplaying"

        def _ipython_display_(self):
            raise NotImplementedError

    save_enabled = f.ipython_display_formatter.enabled
    f.ipython_display_formatter.enabled = True