I would argue that most of these features (basically everything except metaclasses) are not advanced features. These are simple, but for some reason less well k

I would argue that most of these features (basically everything except metaclasses) are not advanced features. These are simple, but for some reason less well known or less used features. Metaclasses are however quite complex (or at least lead to complex behavior) and I mostly avoid them for this reason. And 'Proxy Properties' are not really a feature at all. Just a specific usage of dunder methods.