Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!news2.euro.net!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 0.000
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'bug': 0.02; '3.2': 0.07; 'behavior,': 0.07; 'subject:py3k': 0.07; 'terry': 0.07; 'demonstrates': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:80.91.229.12': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'received:lo.gmane.org': 0.09; 'pm,': 0.11; 'wrote:': 0.14; 'be?': 0.16; 'different,': 0.16; 'outputs': 0.16; 'py3k,': 0.16; 'reedy': 0.16; 'subject:() ': 0.16; 'subject:between': 0.16; 'subject:required': 0.16; 'question.': 0.18; 'bytes': 0.19; 'jan': 0.22; 'code': 0.22; 'header:In-Reply-To:1': 0.22; 'file,': 0.22; 'example': 0.24; 'expect': 0.26; 'thanks': 0.29; 'raise': 0.29; 'subject:?': 0.29; 'assuming': 0.29; '(the': 0.30; 'supposed': 0.31; 'perhaps': 0.32; 'to:addr:python-list': 0.32; 'header:X -Complaints-To:1': 0.34; 'file': 0.35; 'header:User-Agent:1': 0.35; 'subject:/': 0.36; 'platform': 0.36; 'system.': 0.37; 'two': 0.37; 'should': 0.37; 'received:org': 0.38; 'anything': 0.38; 'errors': 0.39; 'printed': 0.39; 'to:addr:python.org': 0.39; 'header:Mime-Version:1': 0.39; 'would': 0.40; 'header:Received:5': 0.40; 'show': 0.67; 'response.': 0.67; 'subject:write': 0.84; 'comparative': 0.91; 'unclear': 0.91
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: py3k buffered IO - flush() required between read/write?
Date: Wed, 11 May 2011 17:38:26 -0400
References: <iqedg8$k5a$7@dont-email.me>	<mailman.1422.1305138322.9059.python-list@python.org> <iqemrg$jp4$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Gmane-NNTP-Posting-Host: rain.gmane.org
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10
In-Reply-To: <iqemrg$jp4$1@dont-email.me>
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.12
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.1431.1305149918.9059.python-list@python.org>
Lines: 29
NNTP-Posting-Host: 82.94.164.166
X-Trace: 1305149919 news.xs4all.nl 65870 [::ffff:82.94.164.166]:43892
X-Complaints-To: abuse@xs4all.nl
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:5164

On 5/11/2011 3:08 PM, Genstein wrote:
> On 11/05/2011 19:24, Terry Reedy wrote:
>> writing and reading. If you want others to look at this more, you should
>> 1) produce a minimal* example that demonstrates the questionable
>> behavior, and 2) show the comparative outputs that raise your question.
>
> Thanks for a quick response. Perhaps I was being unclear - in py3k,
> given the following code and assuming no errors arise:
>
>  > f = open("foo", "w+b")
>  > f.write(b'test')
>  > f.seek(0)
>  > print(f.read(4))
>
> What is the printed result supposed to be?
>
> i) b'test'
> ii) never b'test'
> iii) platform dependent/undefined/other

Good clear question. I expect i).

With 3.2 on winxp, that is what I get with StringIO, text file, and 
bytes file (the first two with b's removed). I would expect the same on 
any system. If you get anything different, I would consider it a bug

-- 
Terry Jan Reedy