[New-bugs-announce] [issue12248] __dir__ semantics changed in Python 2.7.2
Barry A. Warsaw
report at bugs.python.org
Fri Jun 3 01:32:34 CEST 2011
New submission from Barry A. Warsaw <barry at python.org>:
I'm making this a release blocker for 2.7.2 because I want to ensure that the change is deliberate and appropriate. This is triggered by a bug report in Ubuntu where the change in behavior was noticed:
I have two problems with the change that I'd like to describe. First is the NEWS file entry:
- Correct lookup of __dir__ on objects. Among other things, this causes errors
besides AttributeError found on lookup to be propagated.
This isn't associated with a tracker issue, so it's hard to know why this change was made, or whether there was any discussion of its impact.
Second, is this change appropriate for a maintenance release? What problem does it fix and is that worth breaking existing packages for it?
I'll attach a simple test program. Run this under 2.7.1 and it works, run it under 2.7.2rc1 and you get a TypeError.
components: Interpreter Core
nosy: barry, benjamin.peterson
priority: release blocker
title: __dir__ semantics changed in Python 2.7.2
versions: Python 2.7
Added file: http://bugs.python.org/file22225/foo.py
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