R. David Murray added the comment: What are you trying to accomplish that needs an abstract base class?
APIError is not an Exception class, it is a meta-class, and thus it does not match the exception because it is not a *base* class of DriverError (it is DiverError's *meta* class). Now, it is an interesting question whether we want the try/except statement's behavior to match issubclass, since intuitively we think the except in try except is doing the equivalent of issubclass (it isn't). I don't know why this works in python2, but the class/meta-class machinery did undergo some significant changes. So, it is possible that this is in fact a bug (ie: an unintentional change in semantics). If so, it is also a doc bug, since the try statement docs clear say the expression must evaluate to a base class, and the virtual class (abc) docs *only* mention issubclass and isinstance. ---------- nosy: +ncoghlan, r.david.murray, rhettinger _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue25448> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
