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Guido van Rossum wrote:
On Mon, Aug 23, 2010 at 7:46 AM, Benjamin Peterson benjamin@python.org wrote:
2010/8/23 Yury Selivanov yselivanov@gmail.com:
- I propose to change 'hasattr' behaviour in Python 3, making it to swallow only AttributeError exceptions (exactly like 'getattr'). Probably, Python 3.2 release is our last chance.
I would be in support of that.
I am cautiously in favor. The existing behavior is definitely a mistake and a trap. But it has been depended on for almost 20 years now.
I recommend that you create a patch, apply it, run the *entire* stdlib test suite and see how much breaks. That will give you an idea of the damage to expect for 3rd party code.
Robust third-party code is written to avoid 'hasattr', for precisely this reason. Third-party code which relies on 'hasattr' to mask non-AttributeErrors is broken alreay (it just doesn't show the borkedness).
Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tseaver@palladion.com Palladion Software "Excellence by Design" http://palladion.com