Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <oscar.j.benjamin@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.005
X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'else:': 0.03; 'elements.': 0.05; 'properly.': 0.07; 'preserve': 0.09; 'tuple': 0.09; 'cc:addr :python-list': 0.10; 'def': 0.10; 'above?': 0.16; 'benjamin': 0.16; 'cc:name:python list': 0.16; 'wrote:': 0.17; 'object.': 0.22; 'sorry,': 0.22; 'cc:2**0': 0.23; 'cc:addr:python.org': 0.25; 'header:In-Reply-To:1': 0.25; 'message-id:@mail.gmail.com': 0.27; 'obj': 0.29; "i'm": 0.29; 'code': 0.31; 'point': 0.31; 'problem': 0.33; 'received:google.com': 0.34; 'list': 0.35; 'received:209.85': 0.35; "didn't": 0.36; 'received:209': 0.37; 'data': 0.37; 'subject:: ': 0.38; 'apply': 0.39; 'john': 0.60; 'wanting': 0.65; '2013': 0.84; 'oscar': 0.84; 'reid': 0.84
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:mime-version:in-reply-to:references:from:date:message-id :subject:to:cc:content-type; bh=WpQb6TWGosfW8JDrSBXHqsWFV9wGgHKHG/HtkmvVetI=; b=s792GYt1foQw/qc7vX6nUuDeQEUXicF2iYwpbnFXJ5Pa/vqmN4/Rs5rUiVWiVQVloi xmcscR6uIlmukDbWTtFQkubvE17/CsvYkf14GhJ/6Bp25T665ryifGwDGUtfDDjCaadP +O+PsVhpTQQX6FjZN5vn7Z67wWMV3Vx+JwkZa5SnnuQREcwHYW2tPmFAW51OeEphTCTp uEBmiRamL2cfJHGQCImK57zst9AJbrkQe4fnDxDvKR/YfXvgPDcrN0LRh+X5dJznqx5V x7yHT7Uq6AvS73Wyf8FpLW91hA+BWJwcPFF8EYqUZjON+Cvf2EpBkAa29J0Qn2JIo3OK FwAQ==
X-Received: by 10.52.89.83 with SMTP id bm19mr13109433vdb.123.1361189132043; Mon, 18 Feb 2013 04:05:32 -0800 (PST)
MIME-Version: 1.0
In-Reply-To: <CAHVvXxQ1rmKk8djCZj-O3XhJwifHNYyR7JLTgfw_hKQzcoo=bA@mail.gmail.com>
References: <7a40a426-baa9-46f8-8f9d-59ba32b044f3@googlegroups.com> <CAHVvXxQ1rmKk8djCZj-O3XhJwifHNYyR7JLTgfw_hKQzcoo=bA@mail.gmail.com>
From: Oscar Benjamin <oscar.j.benjamin@gmail.com>
Date: Mon, 18 Feb 2013 12:05:11 +0000
Subject: Re: Differences creating tuples and collections.namedtuples
To: John Reid <johnbaronreid@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Cc: Python List <python-list@python.org>
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.1935.1361189141.2939.python-list@python.org>
Lines: 21
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1361189141 news.xs4all.nl 6885 [2001:888:2000:d::a6]:36613
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:39084

On 18 February 2013 12:03, Oscar Benjamin <oscar.j.benjamin@gmail.com> wrote:
> On 18 February 2013 11:47, John Reid <johnbaronreid@gmail.com> wrote:
>> I'm seeing this problem because of the following code in IPython:
>>
>> def canSequence(obj):
>>     if isinstance(obj, (list, tuple)):
>>         t = type(obj)
>>         return t([can(i) for i in obj])
>>     else:
>>         return obj
>
> What is the point of the code above? If obj is a list or a tuple you
> create a new list or tuple with the same data and then return it
> otherwise you just return the object. What about:

Sorry, I didn't read this properly. I see that you want apply can() to
all the elements. What is the reason for wanting to preserve the type
of the sequence?


Oscar