Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
MIME-Version: 1.0
In-Reply-To: <kr31pu$l74$1@ger.gmane.org>
References: <fdc5f317fd454a4dbb9b3033dbe18a60@exch.activenetwerx.com> <CAN1F8qX0KVYYE6=M2hS8DXZJUN3tTG+Uk6c8HTsZkNKMrFcj_w@mail.gmail.com> <CAN1F8qXneccUCs+8cs-7w1yStSrdsaZS8Dg3V2f3BgegiATofA@mail.gmail.com> <kr31pu$l74$1@ger.gmane.org>
From: Joshua Landau <joshua.landau.ws@gmail.com>
Date: Fri, 5 Jul 2013 02:14:02 +0100
Subject: Re: Decorator help
To: python-list <python-list@python.org>
Content-Type: text/plain; charset=UTF-8
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.4259.1372986890.3114.python-list@python.org>
Lines: 33
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: csiph.com comp.lang.python:49913

On 4 July 2013 06:39, Peter Otten <__peter__@web.de> wrote:
> Joshua Landau wrote:
>
>> On 3 July 2013 23:19, Joshua Landau <joshua.landau.ws@gmail.com> wrote:
>>> If you don't want to do that, you'd need to use introspection of a
>>> remarkably hacky sort. If you want that, well, it'll take a mo.
>>
>> After some effort I'm pretty confident that the hacky way is impossible.
>
> Well, technically it's
>
> func.func_closure[0].cell_contents.__name__
>
> but of course you cannot know that for the general case.

I didn't want to do something like that as it implies a lot of
knowledge about the function -- which implies that there's no reason
to do it hacky in the first place. I was using
"inspect.getclosurevars(func).nonlocals" and that "coerces" to a
dictionary first. It's the "correct" way of doing things. But you
never know what name the function inside the wrapper is bound to, so I
didn't accept that.

Also, your method has undefined behaviour AFAIK -- the order of
func_closure is compiler-dependant. If you want to do something like
this, I recommend my method (but it doesn't work for the general case
in the slightest):

    inspect.getclosurevars(func).nonlocals["func"].__name__

If you can't assume the name it's stored in, but you can know the
order of closure variables *then* use Peter's. But again, don't use
either; it's impossible just as I said.