Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!goblin2!goblin.stu.neva.ru!feeder1.cambriumusenet.nl!feed.tweaknews.nl!194.109.133.84.MISMATCH!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <andriy.kornatskyy@live.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.004
X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'python.': 0.02; 'python,': 0.02; 'welcome.': 0.07; 'python': 0.09; 'typed': 0.09; 'language,': 0.11; 'programmer': 0.11; 'interfaces': 0.15; 'classes:': 0.16; 'principal.': 0.16; 'typing': 0.17; 'to:name :python-list@python.org': 0.20; 'thanks.': 0.21; 'programming': 0.23; 'this:': 0.23; 'strongly': 0.27; 'post': 0.28; 'assert': 0.29; 'url:2012': 0.30; 'comments': 0.33; 'from:addr:live.com': 0.33; 'to:addr:python-list': 0.33; 'languages': 0.33; 'two': 0.37; 'being': 0.37; 'skip:l 20': 0.38; 'shows': 0.38; 'to:addr:python.org': 0.39; 'charset:windows-1256': 0.61; 'between': 0.63; 'url:blogspot': 0.64; 'offer': 0.65; 'lack': 0.71; 'url:11': 0.71; 'subjectcharset:windows-1256': 0.75
X-Originating-IP: [213.130.16.2]
From: Andriy Kornatskyy <andriy.kornatskyy@live.com>
To: "python-list@python.org" <python-list@python.org>
Subject: =?windows-1256?Q?duck_typin?= =?windows-1256?Q?g_assert=FE?=
Date: Thu, 8 Nov 2012 20:34:58 +0300
Importance: Normal
Content-Type: text/plain; charset="windows-1256"
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0
X-OriginalArrivalTime: 08 Nov 2012 17:34:58.0461 (UTC) FILETIME=[5FB024D0:01CDBDD7]
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
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.3455.1352396166.27098.python-list@python.org>
Lines: 14
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1352396166 news.xs4all.nl 6894 [2001:888:2000:d::a6]:41339
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:32966


People who come from strongly typed languages that offer interfaces often are confused by lack of one in Python. Python, being dynamic typing programming language, follows duck typing principal. It can as simple as this:
 
assert looks(Foo).like(IFoo)
 
The post below shows how programmer can assert duck typing between two Python classes:
 
http://mindref.blogspot.com/2012/11/python-duck-typing-assert.html
 
Comments or suggestions are welcome.
 
Thanks.
 
Andriy Kornatskyy