Martin Panter added the comment: Cheryl: see also Issue 25777 and Issue 20751, both about the “super binding” under Invoking Descriptors. Raymond: if you want to just pick parts of my patch, go for it. But I don’t understand your concern about explaining the MRO. I think it is important to explain which base classes are skipped, and which are searched. It is not just the type/subclass (super.__thisclass__) entry in the MRO that is skipped; this parameter determines the starting point, so the preceding entries are also skipped. Another problem with referring to “getattr” is that it checks for instance attributes and custom __getattr__ and __getattribute__ implementations, but I don’t think “super” does any of that. Looking at my patch now, I would propose that the exception message only be changed in the current (3.7) branch. ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue23674> _______________________________________