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Mon Aug 23 22:17:46 CEST 2010 · https://mail.python.org/pipermail/python-dev/2010-August/103194.html

2010/8/23 Guido van Rossum <guido at python.org>:
> The main problem I can see with letting exceptions other than
> AttributeError bubble through (besides perverted dependencies on the
> current semantics) is that there are some situations where it is
> pretty arbitrary whether TypeError or AttributeError is raised. I
> can't recall the details, and possibly this was more of a problem with
> classic classes, but I do think it warrants some research.

I believe this was with regards to actual operations, though, not
fetching the attribute. For example, float(a) would raise an
AttributeError for a classic instance and a TypeError for a new-style
instance. However both would raise AttributeError on a.__float__.

-- 
Regards,
Benjamin

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[Python-Dev] 'hasattr' is broken by design