[Python-Dev] PEP 344

Guido van Rossum guido at python.org
Sat Mar 3 02:09:00 CET 2007

Personally, +1 for new attributes, -1 for more syntax, +0 for making
it bad style to pre-create exceptions. One object should have all you

On 3/2/07, Michael Foord <fuzzyman at voidspace.org.uk> wrote:
> Guido van Rossum wrote:
> > [snip..]
> > The one thing that makes me not want to give up yet is that having the
> > traceback, context, cause etc. as attributes of the exception object
> > would seem to make the API for handling exceptions that much cleaner,
> > compared to having to call sys.exc_info() or even "except E as v with
> > tb".
> >
> > So, despite the existence of libraries that pre-create exceptions, how
> > bad would it really be if we declared that use unsafe? It wouldn't be
> > hard to add some kind of boobytrap that goes off when pre-created
> > exceptions are raised multiple times. If this had always been the
> > semantics I'm sure nobody would have complained and I doubt that it
> > would have been a common pitfall either (since if it doesn't work,
> > there's no bad code abusing it, and so there are no bad examples that
> > newbies could unwittingly emulate).
> >
> >
> Personally, I think the new attributes and the new syntax are *great*
> improvements to exception handling. I would be sad to see parts of these
> proposals not happen.
> Michael Foord
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--Guido van Rossum (home page: http://www.python.org/~guido/)

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