def classes(self):
        """
        Additional CSS classnames to add to whatever kind of object this is at output.
        Subclasses of EditHandler should override this, invoking super(B, self).classes() to
        append more classes specific to the situation.
        """

        classes = []

        try:
            classes.append(self.classname)
        except __HOLE__:
            pass

        return classes
dataset/ETHPy150Open torchbox/wagtail/wagtail/wagtailadmin/edit_handlers.py/EditHandler.classes