Re: Simple question

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.datemas.de!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<phildobbin@gmail.com>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.059
X-Spam-Evidence	'H': 0.88; 'S': 0.00; 'verbatim': 0.07; '0.1': 0.09; 'part,': 0.09; 'subject:question': 0.10; 'python': 0.11; "(i'm": 0.16; '0.3': 0.16; 'ellipses': 0.16; 'kern': 0.16; 'all.': 0.16; 'wrote:': 0.18; '>>>': 0.22; 'header:User-Agent:1': 0.23; 'copied': 0.24; 'precise': 0.24; 'cheers,': 0.24; "i've": 0.25; 'header:In-Reply-To:1': 0.27; 'wondering': 0.29; 'robert': 0.30; "i'm": 0.30; "skip:' 10": 0.31; 'closer': 0.31; 'fedora': 0.31; 'purely': 0.31; 'no,': 0.35; 'received:google.com': 0.35; 'i.e.': 0.36; 'subject:Simple': 0.36; 'ubuntu': 0.36; 'done': 0.36; 'thanks': 0.36; 'hi,': 0.36; 'url:org': 0.36; 'message- id:@gmail.com': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'skip:u 10': 0.60; 'lost': 0.61; 'first': 0.61; 'header:Reply-To:1': 0.67; '20,': 0.68; 'book,': 0.68; 'reply-to:no real name:2**0': 0.71; 'london,': 0.72; 'reply- to:addr:gmail.com': 0.80; 'phil': 0.84; 'replied.': 0.84; 'snow': 0.91
DKIM-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:reply-to:organization:user-agent:mime-version :to:subject:references:in-reply-to:content-type :content-transfer-encoding; bh=m5lorFT2Nxv57I1xN5pKuYaBIbmfkcyty2s5b1RZbxw=; b=vJi/RGk/gmkjUJ9jhYc7kuB5ayth5raEtRl16lBkwRDWtQaUL3ds9mKkOd2inmra3b uwsrNg2TWSW9RWhIeLccC90cszQEMpRN51uAXo7Gmj0S7W840o0C6RkMldrxPecWWfk8 Jgd0x6C/VzV4Z3AjHKdAuU1VLJ4dww3FVjmHr3YVwma36ElWGVmmO3tDFwFAzr9D4zIm h7QN3V5EHbHVVHKSitp/LDDK2sTKZfpOsFN01F1vBpOe5Yrx6E/m9qR5wJIWLJCbW0z7 AHZMO7refWxxUTMmavLxmTaWZjF7OxlTeDRsI7oRhxY8y6GtxxRj23Q7m0E8VI654Kqb qTxA==
X-Received	by 10.180.73.137 with SMTP id l9mr3844126wiv.40.1397587126249; Tue, 15 Apr 2014 11:38:46 -0700 (PDT)
Date	Tue, 15 Apr 2014 19:38:43 +0100
From	Phil Dobbin <phildobbin@gmail.com>
Organization	Horse Latitudes Ltd
User-Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:24.0) Gecko/20100101 Thunderbird/24.4.0
MIME-Version	1.0
To	python-list@python.org
Subject	Re: Simple question
References	<534D7807.6050408@gmail.com> <lijtsc$g1s$1@ger.gmane.org>
In-Reply-To	<lijtsc$g1s$1@ger.gmane.org>
Content-Type	text/plain; charset=ISO-8859-1
Content-Transfer-Encoding	7bit
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.15
Precedence	list
Reply-To	phildobbin@gmail.com
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<https://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	<https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.9290.1397587127.18130.python-list@python.org> (permalink)
Lines	44
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1397587127 news.xs4all.nl 2864 [2001:888:2000:d::a6]:52600
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:70285

Show key headers only | View raw

On 15/04/2014 19:30, Robert Kern wrote:

> On 2014-04-15 19:18, Phil Dobbin wrote:
>> Hi, all.
>>
>> I've just started to learn Python (I'm reading Mark Lutz's 'Learning
>> Python' from O'Reilly) & I'm confused as to this part:
>>
>> '>>> 0.1 + 0.1 + 0.1 - 0.3
>> 5.55111.....'
>>
>> Using 'import Decimal' you can get a much closer result i.e.
>> 'Decimal('0.0')'
>>
>> What I'm wondering is why the first calculation that arrives at
>> '5.55111...' is so far out?
> 
> The `...` elides the exponent:
> 
>   >>> 0.1 + 0.1 + 0.1 - 0.3
>   5.551115123125783e-17
> 
> If you copied that verbatim directly out of a book, that's just sloppy
> editing.
> 

No, the ellipses are sloppy editing on my part done purely for brevity.
Unfortunately they elided the relevant part, the meaning of which was,
prior to these conversations, lost on me.

Thanks to all who replied.

Cheers,

  Phil...

-- 
currently (ab)using
CentOS 6.5, Debian Squeeze & Wheezy, Fedora 19 & 20, OS X Snow Leopard,
RHEL 7, Ubuntu Precise & Saucy
GnuGPG Key : http://phildobbin.org/publickey.asc
Based in London, UK

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

Thread

Re: Simple question Phil Dobbin <phildobbin@gmail.com> - 2014-04-15 19:38 +0100

csiph-web