[Python-Dev] PEP 409 update [was: PEP 409 (original) (raw)

Guido van Rossum guido at python.org
Fri Feb 3 03:54:04 CET 2012

On Thu, Feb 2, 2012 at 6:49 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

On Fri, Feb 3, 2012 at 12:42 PM, Ethan Furman <ethan at stoneleaf.us> wrote:

Nick Coghlan wrote:

FWIW, I expect the implementation will allow "raise exc from Ellipsis" as an odd synonym for "raise exc". Are we sure we want that?  Raising from something not an exception seems counter-intuitive (None being the obvious exception). It isn't so much a matter of wanting it as "Is it problematic enough to put any effort into preventing it?" (since allowing it is a natural outcome of the obvious implementation).

I would say yes we want that. It would be strange if you couldn't reset a variable explicitly to its default value. I don't expect people to do this often. But somebody might want to do a deep copy of an exception (with some systematic change), or there might be other reasons. I'm sure a few Python zen items apply here. :-)

-- --Guido van Rossum (python.org/~guido)

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