Path: csiph.com!usenet.pasdenom.info!dedibox.gegeweb.org!gegeweb.eu!nntpfeed.proxad.net!proxad.net!feeder1-2.proxad.net!usenet-fr.net!nerim.net!novso.com!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.024 X-Spam-Evidence: '*H*': 0.95; '*S*': 0.00; 'assignment': 0.07; 'append': 0.09; 'chris,': 0.16; 'inclined': 0.16; 'invisible': 0.16; 'received:172.18.0': 0.16; 'set,': 0.16; 'subclass': 0.16; 'hey': 0.18; 'trying': 0.19; 'to:name:python-list@python.org': 0.22; 'instead.': 0.24; 'header:Received:8': 0.24; 'header:In- Reply-To:1': 0.27; 'work.': 0.31; 'thanks!': 0.32; "i'd": 0.34; 'could': 0.34; 'but': 0.35; 'there': 0.35; 'are,': 0.36; 'charset :us-ascii': 0.36; 'two': 0.37; 'list': 0.37; 'to:addr:python- list': 0.38; 'list,': 0.38; 'to:addr:python.org': 0.39; 'either': 0.39; 'received:unknown': 0.61; "you're": 0.61; 'magical': 0.91 X-Cloudmark-SP-Filtered: true X-Cloudmark-SP-Result: v=1.1 cv=/MiPqmMwFv6ha2ZBybe0ZU9m+O5sXPp7gEUgHVyRzyY= c=1 sm=1 a=b9msaFy8Sb4A:10 a=7PYXob_7ZXMA:10 a=AgG5ixNBvo4A:10 a=BLceEmwcHowA:10 a=kj9zAlcOel0A:10 a=xqWC_Br6kY4A:10 a=oNw28mxuUhXRB3mVwYQ4Ag==:17 a=8Nu0RI1C1JNdftSQErwA:9 a=CjuIK1q_8ugA:10 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=activenetwerx.com; s=default; t=1390344781; bh=gbF/jX2qfoLuEQPZLZ7ghJvahKxhRERO9qNAMfIPIPg=; h=From:To:Subject:Date:References:In-Reply-To; b=KHSGng+fQYOCsmYXxm/ksnUYfDcJ+so4ibDD2hlcH8omODhJepnMIuQ8m/tcHIHuZ NRHl2NBeb2ERNfe6Q6V74sPVb1nBdp5IEYNrn4Y8nwIZr+J//HN02bsdv7zh+/X4Gm 33jMlr9/3KHW4853zhM5IAsIAcyBs3YMhystYtwQ= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=activenetwerx.com; s=default; t=1390344781; bh=gbF/jX2qfoLuEQPZLZ7ghJvahKxhRERO9qNAMfIPIPg=; h=From:To:Subject:Date:References:In-Reply-To; b=KHSGng+fQYOCsmYXxm/ksnUYfDcJ+so4ibDD2hlcH8omODhJepnMIuQ8m/tcHIHuZ NRHl2NBeb2ERNfe6Q6V74sPVb1nBdp5IEYNrn4Y8nwIZr+J//HN02bsdv7zh+/X4Gm 33jMlr9/3KHW4853zhM5IAsIAcyBs3YMhystYtwQ= X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.activenetwerx.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED autolearn=ham version=3.3.1 From: "Joseph L. Casale" To: "python-list@python.org" Subject: RE: Implementing append within a descriptor Thread-Topic: Implementing append within a descriptor Thread-Index: AQHPFkbT1iwWrttJYk6Uyh/I1T8lopqOrizg Date: Tue, 21 Jan 2014 22:52:42 +0000 References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [172.18.0.201] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 13 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1390344784 news.xs4all.nl 2915 [2001:888:2000:d::a6]:45349 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:64459 > You're going to have to subclass list if you want to intercept its > methods. As I see it, there are two ways you could do that: when it's > set, or when it's retrieved. I'd be inclined to do it in __set__, but > either could work. In theory, you could make it practically invisible > - just check to see if you're trying to __set__ a list, and if you > are, set a magical list instead. =20 Hey Chris, That actually is sufficient, assignment can be intercepted and retyped so an append will accomplish what I need. Thanks! jlc