Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.002
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'algorithm': 0.04; 'advance': 0.07; 'string': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'trailing': 0.09; 'useless': 0.09; 'python': 0.11; 'illustrate': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-ipconnect.de': 0.16; 'suggestion.': 0.16; 'wrote:': 0.18; 'cheap': 0.19; 'header:User-Agent:1': 0.23; 'header:X-Complaints-To:1': 0.27; 'testing': 0.29; 'instruction': 0.29; "doesn't": 0.30; 'compared': 0.30; 'cases': 0.33; 'actual': 0.34; 'problem': 0.35; 'but': 0.35; '(we': 0.36; 'false': 0.36; 'should': 0.36; 'skip:- 20': 0.37; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'space': 0.40; 'solve': 0.60; 'occur': 0.65; 'clearer': 0.84; 'otten': 0.84; 'subject:space': 0.84
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: print function and unwanted trailing space
Date: Sat, 31 Aug 2013 15:59:21 +0200
Organization: None
References: <5221a693$0$2059$426a74cc@news.free.fr> <mailman.405.1377938644.19984.python-list@python.org> <5221b68b$0$2280$426a74cc@news.free.fr> <mailman.406.1377945101.19984.python-list@python.org> <5221f0af$0$2412$426a34cc@news.free.fr>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8Bit
X-Gmane-NNTP-Posting-Host: p508488bf.dip0.t-ipconnect.de
User-Agent: KNode/4.7.3
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.412.1377957573.19984.python-list@python.org>
Lines: 37
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1377957573 news.xs4all.nl 15920 [2001:888:2000:d::a6]:55161
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:53356

candide wrote:

> Le 31/08/2013 12:31, Peter Otten a écrit :
>  > softspace = False
>  > for i in range(5):
>  >      if softspace:
>  >          print(end=" ")
>  >      print(i, end="")
>  >      softspace = True
>  > print()
> 
> 
> The if instruction imposes useless testing (we know in advance the
> problem to occur at the very end of the loop) and useless writing
> (writing '').

To make it crystal clear, the above was to illustrate the algorithm used in 
Python 2, not a suggestion. Python 2 uses that "useless testing" -- which is 
cheap compared to actual I/O.

> The following is clearer
> 
> # -------------------------
> n=5
> for i in range(n-1):
>      print(i, end=' ')
> print(n-1)
> # -------------------------
> 
> 
> but doesn't solve all the cases (imagine a string or an iterator).

I still think you should live with a trailing space or go with my actual 
suggestion

print(*range(5))