Eric Snow added the comment: Note that (in my mind, unfortunately) the pickle module looks up several dunder methods on instances. That isn't quite the same thing since the issue is about callable not triggering the descriptor protocol. However it is closely related. I point this out because this similar behavior of pickle is a source of mysterious, hard to understand bugs in many of the same corner cases. Thus I'm -1 on changing the behavior of callable.
>From what I understand, the motivation here is in the case of proxies that dynamically determine their capability and raise AttributeError accordingly. If that is the case then consider prior art such as MagicMock or other existing proxy types on PyPI. Also consider if there is a proxy-specific approach that can resolve the matter. I've long thought there is room in the stdlib for a "proxy" module that holds proxy-related helpers and classes. Finally, instead of changing callable, why not use a metaclass that does the right thing? I believe MagicMock does something along those lines. ---------- nosy: +eric.snow _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23990> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
