@Martin, the only way I can think that that would fail is if _active isn't a list but some list-like object that overrode some magic methods. That's probably not the case here, so I don't see how it *could* fail in that way.
@Martin, the only way I can think that that would fail is if _active isn't a list but some list-like object that overrode some magic methods. That's probably not the case here, so I don't see how it *could* fail in that way.