[Python-Dev] PEP 409 - final? (original) (raw)

Guido van Rossum guido at python.org
Wed Feb 1 19:01:29 CET 2012

Hm... Reading this draft, I like the idea of using "raise X from None", but I still have one quibble. It seems the from clause sets cause, and cause can indicate three things: (1) print cause (explicitly set), (2) print context (default), (3) print neither (raise X from None). For (1), cause must of course be a traceback object. The PEP currently proposes to use two special values: False for (2), None for (3). To me, this has a pretty strong code smell, and I don't want this pattern to be enshrined in a PEP as an example for all to follow. (And I also don't like "do as I say, don't do as I do." :-)

Can we think of a different special value to distinguish between (2) and (3)? Ideally one that doesn't change the nice "from None" idiom, which I actually like as a way to spell this.

Sorry that life isn't easier,

--Guido

On Tue, Jan 31, 2012 at 9:14 PM, Nick Coghlan <ncoghlan at gmail.com> wrote:

On Wed, Feb 1, 2012 at 1:57 PM, Ethan Furman <ethan at stoneleaf.us> wrote:

I haven't seen any further discussion here or in the bug tracker.  Below is the latest version of this PEP, now with a section on Language Details.

Who makes the final call on this?  Any idea how long that will take? (Not that I'm antsy, or anything... ;) Guido still has the final say on PEP approvals as BDFL - it's just that sometimes he'll tap someone else and say "Your call!" (thus making them a BDFOP - Benevolent Dictator for One PEP). FWIW, I'm personally +1 on the latest version of this. Cheers, Nick. -- Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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

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