Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #111687

Re: reversed(enumerate(x))

Path csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From Michael Selik <michael.selik@gmail.com>
Newsgroups comp.lang.python
Subject Re: reversed(enumerate(x))
Date Wed, 20 Jul 2016 20:54:46 -0500
Lines 11
Message-ID <mailman.12.1469066103.22221.python-list@python.org> (permalink)
References <CALwzid=_6zUhLLp-WU9RcqJn0kic8q_LA9fcytG3srqGr+Q2MQ@mail.gmail.com> <B373842F-34E1-4FAC-B97A-15EDB42DCF05@gmail.com>
Mime-Version 1.0 (Mac OS X Mail 9.3 \(3124\))
Content-Type text/plain; charset=us-ascii
Content-Transfer-Encoding 7bit
X-Trace news.uni-berlin.de r/DGACq3IpODb3hdA06SUAl6gYYM1w2KgDLwcaO9Z6tQ==
Return-Path <michael.selik@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.027
X-Spam-Evidence '*H*': 0.95; '*S*': 0.00; 'memory.': 0.05; 'cc:addr :python-list': 0.09; 'argument': 0.15; '``x``': 0.16; 'cc:name:python': 0.16; 'received:io': 0.16; 'received:psf.io': 0.16; 'sequence:': 0.16; 'wrote:': 0.16; 'cc:2**0': 0.20; 'cc:addr:python.org': 0.20; 'large,': 0.22; 'pass': 0.22; 'header :In-Reply-To:1': 0.24; 'message-id:@gmail.com': 0.34; 'received:google.com': 0.35; 'pm,': 0.36; 'subject:: ': 0.37; 'charset:us-ascii': 0.37; 'save': 0.60; 'your': 0.60; 'header :Message-Id:1': 0.61; '20,': 0.66; 'jul': 0.72; 'technique': 0.93
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=AJLNqhnp/m3sFt02y0bA19RSv4IFoSKpYAUcWnVMKnQ=; b=JrsXbyIClbPz0GYje5jml9+GD+kYA5fMzu38W4HbKzZQ2tCd4AOYiNP4KjkCzo2PQV aekzLMY2hi0sBOyhuNQPtheEbT+8ZlyrrSxktEkaWb1QKSfr9RHcvdCA5v3rRl6TLQLN UTxvNTtBkpzc/sRGkrs1eMTVoVjUTBUTRT6bm8u8HTabFkkwqGY9lfEHFFJ4PXzgCZsT 6MBs8er79G2uKBmigmhA3bGaB+yvb8p5sE25pTw4C2FOh5z/0o7I0HBl5ZIzkVVylotz hFNnS/DEmi4Py5/tpq4mu1VfwfCGQFryJXhgz09nucc2NdN0Y4H4PYA6i2PKpPmnJR6x mlvA==
X-Google-DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=AJLNqhnp/m3sFt02y0bA19RSv4IFoSKpYAUcWnVMKnQ=; b=k+rt/oecuB421nxT6nXdiVHx//KXoLn/+m7xpcckLPd0hN7i/aF6iAdAjC4mPnTvKd GKJho67nWPkruTD6/b0APRgdQImMuLUbizUMaSJWl8izCg80xXGh1ZRlwApuJfDIFBXd mbmVxvTFp3yUTZ5IWvXzK/ak/5X2j03gUvGixX5q6L7yzjioLJ++BFCRJOx0sgNvn3Gx WN6Qb6NQv8su0C44EHt2ik4XzvomNmpK6oMYc/+Rl91DHB/ft6gx1n4j2IUEsWiRyPud FcJib0+QtadVKOS2tCpEbbBPTvBagfyP8LIoHHbAItjBXEv0H08yvQdlAgQuwrqX3e5K K/Zw==
X-Gm-Message-State ALyK8tJRY9vz0f7scAks3aVlKH0L3WflqRI+auXapzRrtSoxUNflDS0ke5AfyDV+IPr29A==
X-Received by 10.107.132.199 with SMTP id o68mr46313358ioi.118.1469066100643; Wed, 20 Jul 2016 18:55:00 -0700 (PDT)
In-Reply-To <CALwzid=_6zUhLLp-WU9RcqJn0kic8q_LA9fcytG3srqGr+Q2MQ@mail.gmail.com>
X-Mailer Apple Mail (2.3124)
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.22
Precedence list
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>
X-Mailman-Original-Message-ID <B373842F-34E1-4FAC-B97A-15EDB42DCF05@gmail.com>
X-Mailman-Original-References <CALwzid=_6zUhLLp-WU9RcqJn0kic8q_LA9fcytG3srqGr+Q2MQ@mail.gmail.com>
Xref csiph.com comp.lang.python:111687

Show key headers only | View raw

> On Jul 20, 2016, at 12:42 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> 
>    for i, n in reversed(enumerate(x)): pass
> 
> fails with "TypeError: argument to reversed() must be a sequence".

So make it a sequence:
    for i, n in reversed(list(enumerate(x))): pass

If ``x`` is very large, you can use your zip/range technique to save memory.

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

Thread

Re: reversed(enumerate(x)) Michael Selik <michael.selik@gmail.com> - 2016-07-20 20:54 -0500

csiph-web