[Python-Dev] PEP 344 (original) (raw)

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 need.

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.excinfo() 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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