Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.albasani.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!194.109.133.84.MISMATCH!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.000
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'attributes': 0.05; 'attribute': 0.07; 'infinite': 0.07; 'invokes': 0.09; 'loop.': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:80.91.229.12': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'received:lo.gmane.org': 0.09; 'def': 0.13; 'tries': 0.15; '@property': 0.16; 'attribute,': 0.16; 'crashes': 0.16; 'numpy': 0.16; 'received:dip.t-dialin.net': 0.16; 'received:t-dialin.net': 0.16; 'wrote:': 0.18; 'endless': 0.18; 'idea?': 0.18; 'from:addr:web.de': 0.23; 'stack': 0.24; 'class': 0.29; 'header:X-Complaints-To:1': 0.33; 'named': 0.33; 'to:addr :python-list': 0.34; 'skip:" 10': 0.37; 'replace': 0.38; 'received:org': 0.38; 'some': 0.38; 'to:addr:python.org': 0.40; 'type': 0.61; 'kind': 0.61; 'happen': 0.61; 'recursion.': 0.84; 'subject:Class': 0.84
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: Class: @property -> .__dict__
Date: Fri, 16 Dec 2011 10:32:45 +0100
Organization: None
References: <ad04c206-dbfd-4e49-b365-943b47844c41@n6g2000vbg.googlegroups.com> <4eeb0949$0$29979$c3e8da3$5496439d@news.astraweb.com> <3fe1021b-75ae-4e3d-a5b0-175ad00aefa4@i6g2000vbh.googlegroups.com> <08b0a976-dd2a-4728-b865-4d04f4e5b7fb@n10g2000vbg.googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7Bit
X-Gmane-NNTP-Posting-Host: p5084b384.dip.t-dialin.net
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.3719.1324027975.27778.python-list@python.org>
Lines: 25
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1324027975 news.xs4all.nl 6888 [2001:888:2000:d::a6]:50933
X-Complaints-To: abuse@xs4all.nl
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:17342

Ulrich wrote:

> if I replace it to
> def attributelist(self):
>          # find all attributes to the class that are of type numpy
> arrays:
>          return [attr for attr in dir(self) if
> isinstance(getattr(self, attr), numpy.ndarray)]
> 
> it crashes going into some kind of endless loop.
> 
> Do you happen to have any idea?

dir(self) finds an attribute named "attributelist", getattr(self, 
"attributelist") then tries to calculate the value of that attribute, 
invokes dir(self) which finds an attribute named "attributelist" and so on 
ad infinitum or the stack overflows. Try (untested)

@property
def attributelist(self):
    return [attr for attr in dir(self) if attr != "attributelist" and
            isinstance(getattr(self, attr), numpy.ndarray)]

to avoid the infinite recursion.