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

Groups > comp.lang.python > #73395

Re: Understanding Python Code

Path csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path <ian.g.kelly@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.006
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'subject:Python': 0.06; 'found,': 0.07; 'computed': 0.09; 'newly': 0.09; 'creates': 0.14; 'calculates': 0.16; 'dict': 0.16; 'iteration': 0.16; 'loop.': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'later': 0.20; 'subject:Code': 0.24; 'script': 0.25; 'first,': 0.26; 'values': 0.27; 'header:In- Reply-To:1': 0.27; 'message-id:@mail.gmail.com': 0.30; 'reply.': 0.31; 'calculated': 0.31; 'checked': 0.32; 'but': 0.35; 'received:google.com': 0.35; 'next': 0.36; 'thank': 0.38; 'to:addr :python-list': 0.38; 'pm,': 0.38; 'previous': 0.38; 'does': 0.39; 'to:addr:python.org': 0.39; 'new': 0.61; 'making': 0.63
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=APy/gBmwJXx4SfOO+CkjToEsUx+SVPzGWo4tqW6Y6fA=; b=r/HBXh5ur4GOsGpilI6XqYwrK8TrQfXkm1JkMGpE5BQcn1T5zTf7Kox799MGJlcyR4 rcrW43s8cNYNYep+QHaKlUyUu6u6mU1I81jg8506oOrJ5EAgwXRuScpdoruGyXrs+5R1 9koyIToud7wHIgwOTqrx2qs0S2ejPowarU/iO72R9XI3g70JpMQCarZ4dBP6VmX1p5ET sxDb/lHBMp87QlIpoHiqXFXMDBY6HNK/gfA4bhCjiBXIO3bvAMyxaMylUKGkSxea8j72 Ti2Kl46RymFrmb2oHg04Vh20RXOX+J0PmTBhUZHUhECLScL8ysfNkOerlWDo+LdAGn8S K5WQ==
X-Received by 10.236.179.69 with SMTP id g45mr4688117yhm.81.1403161252568; Thu, 19 Jun 2014 00:00:52 -0700 (PDT)
MIME-Version 1.0
In-Reply-To <03a82bc4-340f-4b16-8dbb-791b706c7862@googlegroups.com>
References <4045d8ca-923d-4384-a684-57cbd80ab7b7@googlegroups.com> <mailman.11118.1403118997.18130.python-list@python.org> <03a82bc4-340f-4b16-8dbb-791b706c7862@googlegroups.com>
From Ian Kelly <ian.g.kelly@gmail.com>
Date Thu, 19 Jun 2014 01:00:12 -0600
Subject Re: Understanding Python Code
To Python <python-list@python.org>
Content-Type text/plain; charset=UTF-8
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 <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.11131.1403161255.18130.python-list@python.org> (permalink)
Lines 11
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1403161255 news.xs4all.nl 2829 [2001:888:2000:d::a6]:38213
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:73395

Show key headers only | View raw

On Wed, Jun 18, 2014 at 11:50 PM,  <subhabangalore@gmail.com> wrote:
> Thank you for the reply. But as I checked it again I found,
> f_prev[k] is giving values of f_curr[st] = e[st][x_i] * prev_f_sum
> which is calculated later and again uses prev_f_sum.

f_prev is the f_curr that was calculated on the previous iteration of
the loop.  At each iteration after the first, the script calculates
f_curr based on the value of f_prev, that is, the old value of f_curr.
Then it reassigns the newly computed f_curr to f_prev, making it now
the previous, and on the next iteration it creates a new dict to store
the next f_curr.  Does that make sense?

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

Thread

Understanding Python Code subhabangalore@gmail.com - 2014-06-18 09:36 -0700
  Re: Understanding Python Code Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-18 13:15 -0600
    Re: Understanding Python Code subhabangalore@gmail.com - 2014-06-18 22:50 -0700
      Re: Understanding Python Code Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-19 01:00 -0600
        Re: Understanding Python Code subhabangalore@gmail.com - 2014-06-19 02:48 -0700
          Re: Understanding Python Code Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-19 08:09 -0600
            Re: Understanding Python Code subhabangalore@gmail.com - 2014-06-19 07:27 -0700
              Re: Understanding Python Code subhabangalore@gmail.com - 2014-06-19 11:44 -0700
                Re: Understanding Python Code Ian Kelly <ian.g.kelly@gmail.com> - 2014-06-19 13:07 -0600
                Understanding Python Code[Forward_Backward_Wikipedia] subhabangalore@gmail.com - 2014-06-21 15:05 -0700

csiph-web