def format_output(self, rendered_widgets):
        return u''.join(rendered_widgets)
Notify all extension drivers during subnet update.
dataset/ETHPy150Open CollabQ/CollabQ/vendor/django/forms/widgets.py/MultiWidget.format_output--crossover with--dataset/ETHPy150Open openstack/neutron/neutron/plugins/ml2/managers.py/ExtensionManager.process_update_subnet