[Python-3000] self-contained exceptions

[Guido van Rossum]

On 1/4/07, Phillip J. Eby <pje at telecommunity.com> wrote:
> At 01:41 AM 1/4/2007 -0600, Ka-Ping Yee wrote:
> >How about this?
> >
> >      except ExcType, e:
> >          try:
> >              # body
> >          finally:
> >              e = None
>
> It's a little bit more difficult to explain in the reference manual.  I was
> figuring we'd say that the exception variable is bound only in the body of
> the except clause; saying it becomes None when you exit sounds weirder to
> me.  How about:
>
>       except ExcType, e:
>           try:
>               # body
>           finally:
>               e = None
>               del e
>
> Then we get the best of all three worlds: a clean explanation, a clean
> implementation, and a pure source-to-source transformation.

Great! We need (a) an update to PEP 3100 and (b) a patch to implement
this. (Once we have this we can talk about the rest of PEP 344;
perhaps that PEP should also target Py3k only?)

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)