Hacker News Reader

This is wild. Is it part of Python's specification, or an implementation detail of CPython?

As far as I understand, CPython implementation is THE specification. Some billions dollar ERP system firmly rely on this behavior, btw.

Yeah, I was afraid you would say that.

Just check with pypy and Graalpy. Both support this as well.

Is the question whether multiple base classes are part of Python’s spec, or if the ability to assign to `__class__` is part of the spec?