[Python-Dev] PEP 318 - posting draft (original) (raw)

Bob Ippolito bob at redivi.com
Tue Mar 23 12:26:21 EST 2004

On Mar 23, 2004, at 12:02 PM, Skip Montanaro wrote:

Here's the current state of PEP 318. I have to take a break from this to get some real work done and may not get back to it in a major way for awhile. I received a significant rewrite of Kevin Smith's most recent version from Jim Jewett and incorporated much of what he wrote, modifying a lot of it along the way, but have still not digested everything he sent me.

I've tried to reflect the concensus which seems to be emerging on the python-dev list, though I suspect I've done a poor job of that. The discussions there and on comp.lang.python have ranged far and wide and thus resist summary in a finite amount of time. I recommend interested comp.lang.python readers spend some time in the python-dev archives for February and March if they find major fault with the current state of the proposal. If you post corrections or comments to either list I should see them. Skip Montanaro ----------------------------------------------------------------------- ------- PEP: 318 Title: Function/Method Decorator Syntax Version: Revision:1.5Revision: 1.5 Revision:1.5 Last-Modified: Date:2004/03/2316:41:17Date: 2004/03/23 16:41:17 Date:2004/03/2316:41:17 Author: Kevin D. Smith <Kevin.Smith at theMorgue.org>, Jim Jewett <jimjjewett at users.sourceforge.net>, Skip Montanaro <skip at pobox.com> Status: Draft Type: Standards Track Content-Type: text/x-rst Created: 05-Jun-2003 Python-Version: 2.4 Post-History: 09-Jun-2003, 10-Jun-2003, 27-Feb-2004, 23-Mar-2004 --snip-- with an alternative that places the decoration in the function's declaration:: def foo(cls) using [synchronized(lock), classmethod]: pass

Shouldn't the using keyword go away, so it's consistent with the
current implementation?

Current Implementation ======================

Michael Hudson has posted a patch at Starship, which implements the proposed syntax and left-first application of decorators:: def func(arg1, arg2, ...) [dec1, dec2]: pass is equivalent to:: def func(arg1, arg2, ...): pass func = dec2(dec1(func)) though without the intermediate creation of a variable named func. .. patch: http://starship.python.net/crew/mwh/hacks/meth-syntax-sugar.diff

The current implementation is here, as far as I know: http://starship.python.net/crew/mwh/hacks/meth-syntax-sugar-3.diff

Possible Extensions ===================

The proposed syntax is general enough that it could be used on class definitions as well:: class foo(object) [dec1, dec2, ...]: class definition here Use would likely be much less than function decorators. The current patch only implements function decorators.

The current patch does implement class decorators, with this syntax.

-bob

More information about the Python-Dev mailing list