[Python-Dev] PEP 348 (exception reorg) revised again
bcannon at gmail.com
Mon Aug 15 19:36:46 CEST 2005
OK, I will take this as BDFL pronouncement that ditching bare
'except's is just not going to happen. Had to try. =)
And I will strip out the TerminatingException proposal.
On 8/15/05, Guido van Rossum <gvanrossum at gmail.com> wrote:
> I'm with Raymond here.
> On 8/15/05, Raymond Hettinger <raymond.hettinger at verizon.net> wrote:
> > [Brett]
> > > This obviously goes against what Guido last said he
> > > wanted, but I hope I can convince him to get rid of bare 'except's.
> > -1 on eliminating bare excepts. This unnecessarily breaks tons of code
> > without offering ANY compensating benefits. There are valid use cases
> > for this construct. It is completely Pythonic to have bare keywords
> > apply a useful default as an aid to readability and ease of coding.
> > +1 on the new BaseException
> > +1 on moving NotImplementedError, SystemExit, and KeyboardInterrupt.
> > -1 on replacing "except (KeyboardInterrupt, SystemExit)" with "except
> > TerminatingException". 1) Grepping existing code bases shows that these
> > two are almost never caught together so it is a bit silly to introduce a
> > second way to do it. 2) Efforts to keep the builtin namespace compact
> > argue against adding a new builtin that will almost never be used. 3)
> > The change unnecessarily sacrifices flatness, making the language more
> > difficult to learn. 4) The "self-documenting" rationale is weak -- if
> > needed, a two-word comment would suffice. Existing code almost never
> > has had to comment on catching multiple exceptions -- the exception
> > tuple itself has been sufficiently obvious and explicit. This rationale
> > assumes that code readers aren't smart enough to infer that SystemExit
> > has something to do with termination.
> > Raymond
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> --Guido van Rossum (home page: http://www.python.org/~guido/)
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