[Python-Dev] Nonlocal shortcut (original) (raw)

Calvin Spealman ironfroggy at gmail.com
Mon Dec 8 23:52:12 CET 2008

Did the original PEP discussion cover debates about the shortcut working for all assignment operators (like += and x[i] =) and the difference between it being one-shot (doesnt affect x for the rest of the function) or simply the unrolling into nonlocal x; x= y as it is?

On Mon, Dec 8, 2008 at 5:07 PM, Guido van Rossum <guido at python.org> wrote:

On Sun, Dec 7, 2008 at 2:45 PM, Amaury Forgeot d'Arc <amauryfa at gmail.com> wrote:

Hello,

Fabio Zadrozny wrote: Hi,

I'm currently implementing a parser to handle Python 3.0, and one of the points I found conflicting with the grammar specification is the PEP 3104. It says that a shortcut would be added to Python 3.0 so that "nonlocal x = 0" can be written. However, the latest grammar specification (http://docs.python.org/dev/3.0/reference/grammar.html?highlight=full%20grammar) doesn't seem to take that into account... So, can someone enlighten me on what should be the correct treatment for that on a grammar that wants to support Python 3.0? An issue was already filed about this: http://bugs.python.org/issue4199 It should be ready for inclusion in 3.0.1. No it should not. It should be put in 3.1. I strongly object against the addition of features of any kind to 3.0.1, no matter whether they were promised or announced in a PEP or in the docs or on the 8 o'clock news. This would make 3.0.0 forever a "loser" release. (I find the removal of 'cmp' hard to swallow too, but in a sense the addition of features is worse, as it makes downgrading a risk. Upgrades, no matter how minimal, always represent risks -- however downgrading shouldn't represent risks, unless you happen to depend on a bugfix that wasn't present in the downgrade -- but we're not talking about a bugfix here no matter how you bend the English language.) -- --Guido van Rossum (home page: http://www.python.org/~guido/)

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