Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!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 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'else:': 0.03; 'from:addr:yahoo.co.uk': 0.04; 'assign': 0.07; 'debug': 0.07; 'debugging': 0.07; 'friday,': 0.09; 'lawrence': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'tismer': 0.09; 'python': 0.11; '#else': 0.16; '#ifdef': 0.16; '__future__': 0.16; 'c/c++': 0.16; 'lambda:': 0.16; 'macros.': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'spacing': 0.16; 'subject:python': 0.16; 'prevent': 0.16; 'language': 0.16; 'wrote:': 0.18; 'code.': 0.18; 'variable': 0.18; 'things.': 0.19; 'thanks.': 0.20; '>>>': 0.22; 'example': 0.22; 'programming': 0.22; 'import': 0.22; 'python?': 0.22; 'print': 0.22; 'header:User-Agent:1': 0.23; 'instance,': 0.24; 'url:moin': 0.24; '15,': 0.26; 'define': 0.26; 'shown': 0.26; 'second': 0.26; 'certain': 0.27; 'header:X-Complaints-To:1': 0.27; 'header:In- Reply-To:1': 0.27; 'function': 0.29; 'chris': 0.29; 'statement': 0.30; 'work.': 0.31; 'code': 0.31; 'url:wiki': 0.31; 'usually': 0.31; 'post.': 0.31; 'thanks!': 0.32; "we're": 0.32; 'url:python': 0.33; 'fri,': 0.33; 'could': 0.34; 'something': 0.35; 'but': 0.35; 'there': 0.35; 'possible': 0.36; 'similar': 0.36; 'url:org': 0.36; 'should': 0.36; 'christian': 0.38; 'implement': 0.38; 'thank': 0.38; 'nov': 0.38; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'to:addr:python.org': 0.39; 'enough': 0.39; 'either': 0.39; 'received:org': 0.40; 'read': 0.60; 'above,': 0.60; 'dave': 0.60; 'world.': 0.61; 'you.': 0.62; 'kind': 0.63; 'yes': 0.68; 'received:2': 0.84; 'subject: #': 0.96; '2013': 0.98 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Mark Lawrence Subject: Re: Implementing #define macros similar to C on python Date: Sat, 16 Nov 2013 00:22:25 +0000 References: <69e7aee9-ad78-412e-9e1c-84b5a855acc9@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: host-2-98-196-224.as13285.net User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 In-Reply-To: <69e7aee9-ad78-412e-9e1c-84b5a855acc9@googlegroups.com> 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: 75 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1384561357 news.xs4all.nl 15913 [2001:888:2000:d::a6]:37968 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:59578 On 15/11/2013 23:36, JL wrote: > Thanks! This is the answer which I am seeking. However, I am not able to get the following line to work. I am using python 2.7.5 > > debug_print = print > > Can we assign a function into a variable in this manner? > > On Friday, November 15, 2013 11:49:52 AM UTC+8, Chris Angelico wrote: >> On Fri, Nov 15, 2013 at 1:29 PM, JL wrote: >> >>> One of my favorite tools in C/C++ language is the preprocessor macros. >> >>> >> >>> One example is switching certain print messages for debugging use only >> >>> >> >>> #ifdef DEBUG_ENABLE >> >>> DEBUG_PRINT print >> >>> #else >> >>> DEBUG_PRINT >> >>> >> >>> Is it possible to implement something similar in python? Thank you. >> >> >> >> There are usually other ways to do things. For instance, you can >> >> define a function to either do something or do nothing: >> >> >> >> if debug_mode: >> >> debug_print = print >> >> else: >> >> debug_print = lambda: None >> >> >> >> debug_print("This won't be shown unless we're in debug mode!") >> >> >> >> But as Dave says, you could write a preprocessor if you need one. >> >> >> >> ChrisA Yes but please don't top post. Actually print is a statement in Python 2 so your code should work if you use from __future__ import print_function at the top of your code. Would you also be kind enough to read and action this https://wiki.python.org/moin/GoogleGroupsPython to prevent the double line spacing shown above, thanks. -- Python is the second best programming language in the world. But the best has yet to be invented. Christian Tismer Mark Lawrence