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Sat Nov 20 17:28:40 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-November/105769.html

On 20/11/2010 16:06, Michael Foord wrote:
> On 20/11/2010 16:01, Nick Coghlan wrote:
> [snip...]
>> The retrieval of __class__ is a
>> normal lookup on the object, so it can trigger all of the things
>> getattr_static is trying to avoid (unavoidable if you want to support
>> proxy classes at all), and the lookup of __mro__ invokes all of those
>> things on the metaclass.
>
> __class__ and mro lookup are noted in the docs as being exceptions. We 
> could actually remove the __class__ lookup from the list of exceptions 
> by using type(...) instead of obj.__class__.
>

Done.

>> I'll see if I'm still of the same opinion after I sleep on it, but my
>> first impression of the docs was that they slightly oversold the
>> strength of the "doesn't execute arbitrary code" aspect of the new
>> function. The existing caveats were all relating to when getattr() and
>> getattr_static() might give different answers, while the additional
>> caveats I was suggesting related to cases where arbitrary code may
>> still be executed.
> I'm happy to change the wording to make the promise less strong.

I've also removed the __mro__ exception. This is done with:

     type.__dict__['__mro__'].__get__(klass)

If you can think of any other exceptions then please let me know.

Michael

> All the best,
>
> Michael
>
>> Cheers,
>> Nick.
>>
>
>

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[Python-Dev] [Python-checkins] r86566 - in python/branches/py3k: Doc/glossary.rst Doc/library/inspect.rst Lib/inspect.py Lib/test/test_inspect.py Misc/NEWS Misc/python-wing4.wpr