duck typing assert

Path	csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed6.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 0.003
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; '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; 'between': 0.63; 'offer': 0.65; 'skip:m 50': 0.65; 'lack': 0.71; 'charset:windows-1251': 0.97
X-Originating-IP	[213.130.16.2]
From	Andriy Kornatskyy <andriy.kornatskyy@live.com>
To	"python-list@python.org" <python-list@python.org>
Subject	duck typing assert
Date	Thu, 8 Nov 2012 20:30:02 +0300
Importance	Normal
Content-Type	text/plain; charset="windows-1251"
Content-Transfer-Encoding	quoted-printable
MIME-Version	1.0
X-OriginalArrivalTime	08 Nov 2012 17:30:02.0593 (UTC) FILETIME=[AF564510:01CDBDD6]
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.3454.1352395870.27098.python-list@python.org> (permalink)
Lines	18
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1352395870 news.xs4all.nl 6989 [2001:888:2000:d::a6]:38557
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:32965

Show key headers only | View raw

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:

mindref.blogspot.com/2012/11/python-duck-typing-assert.html

Comments or suggestions are welcome.

Thanks.

Andriy Kornatskyy

Back to comp.lang.python | Previous | Next | Find similar | Unroll thread

Thread

duck typing assert Andriy Kornatskyy <andriy.kornatskyy@live.com> - 2012-11-08 20:30 +0300

csiph-web