Python's None is exclusively for 'the thing here explicitly doesn't exist' ('the thing here is empty' would be an empty collection and 'something which has neve

Python's None is exclusively for 'the thing here explicitly doesn't exist' ('the thing here is empty' would be an empty collection and 'something which has never been set' is signified by raising an exception). I think that's the closest you're gonna get to the language you asked for in your last paragraph, because not being able to delete or unset a variable seems to be a serious design flaw to me.