Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!newsgate.cistron.nl!newsgate.news.xs4all.nl!194.109.133.85.MISMATCH!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <andrea.crotti.0@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.043
X-Spam-Evidence: '*H*': 0.91; '*S*': 0.00; 'python': 0.08; 'def': 0.13; '3.2,': 0.16; 'closure.': 0.16; 'object)': 0.16; 'cc:addr :python-list': 0.16; 'wrote:': 0.18; 'switched': 0.18; 'cc:no real name:2**0': 0.20; 'header:In-Reply-To:1': 0.22; 'cc:2**0': 0.24; 'code': 0.25; 'function': 0.27; 'import': 0.27; 'variable': 0.28; 'cc:addr:python.org': 0.29; 'pm,': 0.29; 'definition': 0.30; 'object.': 0.30; 'source': 0.31; "didn't": 0.31; 'version': 0.32; 'message-id:@gmail.com': 0.33; 'header:User-Agent:1': 0.33; 'actually': 0.33; 'anything': 0.34; 'received:74.125.82': 0.35; 'running': 0.35; 'opposed': 0.37; 'but': 0.37; 'received:74.125': 0.37; 'received:google.com': 0.37; "there's": 0.37; 'using': 0.38; 'received:10.0.0': 0.38; 'some': 0.38; 'supply': 0.69; 'have.': 0.77; '05:11': 0.84; 'yours.': 0.95
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; bh=XB8bQztoM97bdb5eDgzOFF3Nr/nARcZOrIDuGtAE9YY=; b=gwhQxC5Qo0fFM70Od7teUQFPy24EgVSnZtXST3rglqsLHyoG3Zyq1EusSl72SxWfJQ qyyDXBX4/95x+VUj8n7zWdWxRjpE/XV5eFovq7DttHdVTkKcJo4Js0PuVoP1gx+0YrNF 3+A3mkxCE91mCQSKEcujwFzOR6JJvHWVZKtjE=
Date: Mon, 21 Nov 2011 17:17:12 +0000
From: Andrea Crotti <andrea.crotti.0@gmail.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:8.0) Gecko/20111108 Thunderbird/8.0
MIME-Version: 1.0
To: d@davea.name
Subject: Re: decorators and closures
References: <4ECA63D2.7080603@gmail.com> <4ECA68D8.2060608@davea.name> <4ECA6FB1.6000701@gmail.com> <4ECA8642.7060908@davea.name>
In-Reply-To: <4ECA8642.7060908@davea.name>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: python-list@python.org
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.2916.1321895843.27778.python-list@python.org>
Lines: 35
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1321895843 news.xs4all.nl 6915 [2001:888:2000:d::a6]:56974
X-Complaints-To: abuse@xs4all.nl
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:16030

On 11/21/2011 05:11 PM, Dave Angel wrote:
>
> You didn't mention what version of Python you're running.  With Python 
> 2, I got very different results.  So I switched to Python 3.2, and I 
> still don't get exactly what you have.
>
> A closure is needed if there's some non-global data outside the 
> function definition (code object) that's needed by the function 
> object.  As you supply the code I don't need a closure.  But if I add 
> a local variable in test_decorate(), and refer to it in dec(), then I 
> get one.  Not the same as yours.
>
> You left out the import and the definition line for test_decorate.  
> Did you leave anything else?  And what version of Python are you 
> using?  Are you perhaps running in a shell, as opposed to running code 
> directly from a source file?

I use python 2.7, and actually the whole source is this (test_decorate.py):

def dec(fn):
   def _dec():
       fn()

   return _dec

@dec
def fun():
   print("here")

fun()


Using ipython:
import test_decorate
dis.dis(test_decorate)