[Python-Dev] __getattr__ and new style classes

[Brett Cannon]

On Thu, Oct 9, 2008 at 5:37 PM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Amaury Forgeot d'Arc wrote:
>
>> But this is already the case, and the reason why there are three
>> variable to describe an exception: type, value and traceback.
>
> Yes, but you only get one object for the value, which means
> at least allocating a tuple if you want to be able to report
> something like "AttributeError: 'fooblat' object has no
> attribute 'asdf'".
>
> I'm thinking about a C api that would let you supply multiple
> pre-existing values without having to allocate anything.
> Not sure exactly how it would work, though.
>
> Also, what about Py3? Has the type/value separation gone away
> completely, or is it still there at the C level?
>

It's still there. I think the major C changes for exceptions was
adding support for the three new attributes (__traceback__,
__context__, and __cause__).

-Brett