Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!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 0.000
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'output': 0.04; 'none,': 0.05; 'python3': 0.05; 'default.': 0.07; 'enabled.': 0.07; 'means,': 0.07; 'newline': 0.07; 'sys,': 0.07; 'python': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; "skip:' 30": 0.15; 'skip:p 40': 0.15; 'fix:': 0.16; "isn't.": 0.16; 'received:80.91.229.3': 0.16; 'received:dip.t-dialin.net': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-dialin.net': 0.16; 'wrote:': 0.17; '3.2': 0.22; 'latter': 0.22; 'universal': 0.22; 'header:User-Agent:1': 0.26; 'skip:" 20': 0.26; 'header:X -Complaints-To:1': 0.28; '+0100,': 0.29; '3.1': 0.29; 'cat': 0.29; "d'aprano": 0.29; 'steven': 0.29; "skip:' 10": 0.30; 'fri,': 0.30; 'to:addr:python-list': 0.33; 'nov': 0.35; 'received:org': 0.36; 'but': 0.36; 'should': 0.36; 'skip:p 20': 0.36; 'subject:: ': 0.38; 'to:addr:python.org': 0.39; 'header:Received:5': 0.40; 'think': 0.40; 'start-up,': 0.84
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: enabling universal newline
Date: Sat, 03 Nov 2012 09:26:39 +0100
Organization: None
References: <alpine.DEB.2.00.1211022316290.2869@pebbe> <509452ae$0$29967$c3e8da3$5496439d@news.astraweb.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7Bit
X-Gmane-NNTP-Posting-Host: p50849822.dip.t-dialin.net
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.3232.1351931198.27098.python-list@python.org>
Lines: 30
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1351931198 news.xs4all.nl 6890 [2001:888:2000:d::a6]:50521
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:32684

Steven D'Aprano wrote:

> On Fri, 02 Nov 2012 23:22:53 +0100, Peter Kleiweg wrote:
> 
>> In Python 3.1 and 3.2
>> 
>> At start-up, the value of sys.stdin.newlines is None, which means,
>> universal newline should be enabled. But it isn't.
> 
> What makes you think it is not enabled?

$ python3 -c 'open("tmp.txt", "wb").write(b"a\nb\r\nc\rd")'

This is the output with universal newlines:

$ python3 -c 'print(open("tmp.txt").readlines())'
['a\n', 'b\n', 'c\n', 'd']

But this is what you get from stdin:

$ cat tmp.txt | python3 -c 'import sys; print(sys.stdin.readlines())'
['a\n', 'b\r\n', 'c\rd']

With Peter Kleiweg's fix:

$ cat tmp.txt | python3 -c 'import sys, io; print(io.TextIOWrapper(sys.stdin.detach(), newline=None).readlines())'
['a\n', 'b\n', 'c\n', 'd']

I think it's reasonable to make the latter the default.