Message 197883 - Python tracker

Message197883

Author	ncoghlan
Recipients	barry, eli.bendersky, ethan.furman, ncoghlan, pitrou, r.david.murray
Date	2013-09-16.09:02:46
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<CADiSq7dYuNE1dNWtPqgBARg7TxU9+uSAFCmeLN3pqAXuEkZBGg@mail.gmail.com>
In-reply-to	<1379320610.32.0.0643181219351.issue19030@psf.upfronthosting.co.za>

Content
Right, we definitely want inspect to swallow the exceptions from descriptors. My suggestion is merely to switch the order to be: 1. Try getattr 2. If that throws an exception, check __dict__ directly 3. If neither works (e.g. due to a buggy __dir__ method), ignore the attribute entirely. The problem at the moment is working descriptors that are designed to fall back on the metaclass lookup are being mishandled.

Content

Right, we definitely want inspect to swallow the exceptions from
descriptors. My suggestion is merely to switch the order to be:
1. Try getattr
2. If that throws an exception, check __dict__ directly
3. If neither works (e.g. due to a buggy __dir__ method), ignore the
attribute entirely.

The problem at the moment is *working* descriptors that are designed to
fall back on the metaclass lookup are being mishandled.

History
Date	User	Action	Args
2013-09-16 09:02:46	ncoghlan	set	recipients: + ncoghlan, barry, pitrou, r.david.murray, eli.bendersky, ethan.furman
2013-09-16 09:02:46	ncoghlan	link	issue19030 messages
2013-09-16 09:02:46	ncoghlan	create