Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]


Groups > comp.lang.python > #46331

Re: Python #ifdef

Path csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!xlned.com!feeder7.xlned.com!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <davea@davea.name>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.017
X-Spam-Evidence '*H*': 0.97; '*S*': 0.00; 'cpython': 0.05; 'subject:Python': 0.06; 'compile-time': 0.09; 'python': 0.11; '2.7': 0.14; '__future__': 0.16; 'possible?': 0.16; 'received:74.208.4.195': 0.16; 'statement)': 0.16; 'variables,': 0.16; 'wrote:': 0.18; 'code.': 0.18; 'module': 0.19; 'import': 0.22; 'header:User-Agent:1': 0.23; 'file.': 0.24; 'define': 0.26; 'header:In-Reply-To:1': 0.27; 'function': 0.29; 'thus': 0.29; "doesn't": 0.30; 'mix': 0.30; 'code': 0.31; "skip:' 10": 0.31; '3.x': 0.31; 'quite': 0.32; 'checking': 0.33; "i'd": 0.34; 'something': 0.35; 'objects': 0.35; 'but': 0.35; 'there': 0.35; 'doing': 0.36; 'possible': 0.36; 'so,': 0.37; 'implement': 0.38; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'that,': 0.38; 'does': 0.39; 'to:addr:python.org': 0.39; 'reserved': 0.61; "you're": 0.61; 'received:74.208': 0.68; 'biggie': 0.84; 'carlos': 0.91; 'subject: #': 0.96
Date Tue, 28 May 2013 15:57:49 -0400
From Dave Angel <davea@davea.name>
User-Agent Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6
MIME-Version 1.0
To python-list@python.org
Subject Re: Python #ifdef
References <BLU176-W12FAFEA3C7AFD687855E04D7970@phx.gbl>
In-Reply-To <BLU176-W12FAFEA3C7AFD687855E04D7970@phx.gbl>
Content-Type text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding 7bit
X-Provags-ID V02:K0:efboiy7KV4igMtAbAO1AmnvZx+Vs4Q12NbAhBU9eISX RO/y/j6AOqI2v0+eD9Q6ztsQHvX6TEIOHpSkfWmW2BspeYXl5m HC5R2klErqrGcfs/dJrJvNfqnsUziL3YS8/zeI01/9bjnulg7c 2pCBtep8n9ZID83f9ji37IREtMFxhh5mfTk7AaGGof5DJrWN3t QtXQ4yAtrhEIoQxfpCDYN2i41WsWtvM2rbr0iubX/n0fZjjyg8 WqdzuUn3G+ZUBngm8/KmcQ7PpVlPqXK7gJ1CJQCOA18jmJJVne n0keS8GiTmQmutoFL45b9ZxtZMCy/LVnf/eIep12rpRcErpNfl JrciE+gQnHoTTCV0EKjM=
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.2319.1369771083.3114.python-list@python.org> (permalink)
Lines 23
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1369771083 news.xs4all.nl 15997 [2001:888:2000:d::a6]:51609
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:46331

Show key headers only | View raw


On 05/28/2013 03:46 PM, Carlos Nepomuceno wrote:
> Are there Python 'preprocessor directives'?

Python doesn't define a preprocessor, and CPYthon doesn't implement one. 
  Nothing to stop you from doing so, however.
>
> I'd like to have something like '#ifdef' to mix code from Python 2 and 3 in a single file.
>
> Is that possible? How? 		 	   		
>

It's quite possible that you don't need a preprocessor do what you want, 
since Python does much less compile-time checking than C.  Also, it's 
possible to store function objects and module objects in variables, and 
thus to hide many things from the body of the code.

One biggie is print, since that's a reserved word (and a statement) in 
Python 2.x.  But if you're using 2.7 you can use from __future__ import 
print, or something like that, and just use 3.x function semantics.


-- 
DaveA

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


Thread

Re: Python #ifdef Dave Angel <davea@davea.name> - 2013-05-28 15:57 -0400

csiph-web