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

Groups > comp.lang.python > #86093

Re: Design thought for callbacks

Path csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path <rosuav@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.002
X-Spam-Evidence '*H*': 1.00; '*S*': 0.00; 'algorithm': 0.04; 'explicitly': 0.05; 'interpreter': 0.05; 'memory.': 0.07; 'suppose': 0.07; '22,': 0.09; 'function,': 0.09; 'high-level': 0.09; 'cc:addr:python-list': 0.11; 'python': 0.11; 'def': 0.12; 'language,': 0.12; 'assume': 0.14; 'language.': 0.14; 'blanket': 0.16; 'extension,': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'fix': 0.17; 'wrote:': 0.18; 'feb': 0.22; 'programming': 0.22; 'coding': 0.22; 'cc:addr:python.org': 0.22; 'this?': 0.23; 'recognize': 0.24; 'cc:2**0': 0.24; 'header:In-Reply-To:1': 0.27; 'function': 0.29; "doesn't": 0.30; 'waste': 0.30; 'message-id:@mail.gmail.com': 0.30; 'along': 0.30; 'work.': 0.31; 'that.': 0.31; 'evil': 0.31; 'programmers': 0.33; 'received:google.com': 0.35; 'leads': 0.36; 'should': 0.36; 'level': 0.37; 'pm,': 0.38; 'that,': 0.38; 'either': 0.39; 'how': 0.40; 'even': 0.60; 'you.': 0.62; 'high': 0.63; 'such': 0.63; 'advantages': 0.68; 'helping': 0.70; 'computers': 0.72; 'subject:Design': 0.78; '2015': 0.84; 'optimized,': 0.84; 'subject:thought': 0.84; 'to:none': 0.92
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=AFPH1wi0Dfqeww0cbivjqR0jX3alzLxMILPY4pRA768=; b=MxROLVfF1IfWKQxa4xYRu+TVbPZqVOTvtlNaqRTUSZFhfmsgYXrWYiQWQE1urit+9b mjS2CcwrS/yLN6TJq4Wk8imQV7IRMRvwozI6oVGdc9xIiVyUyU4ixfkiAaxvmSNW+Noi FFkEs520V1GjYd827x4jQnH5OWNalCCDOcMLYg3oAkjTAR+lRy/G/JoK/VNK3taV4asK giL1uo1Vhs0zYF5nthsVx3NTpv9EHEXnOKnC403MPCXI6oFwqKY6FQRkfixcRILQmF24 wGAV6pH0qz73DK9NvXG5Tuj3jxcS8UXbMQUZHBDY8S0BjtbrS9mtV34AIkrnKkAbPnyy rQoQ==
MIME-Version 1.0
X-Received by 10.50.114.4 with SMTP id jc4mr6786347igb.14.1424600477924; Sun, 22 Feb 2015 02:21:17 -0800 (PST)
In-Reply-To <87ioeui9zd.fsf@elektro.pacujo.net>
References <33677AE8-B2FA-49F9-9304-C8D93784255D@gmail.com> <CAPTjJmpEHQV2PpaZvszuTGn0_GNg0sWV6aLenbQsZrSXCy2YKQ@mail.gmail.com> <mailman.18957.1424524392.18130.python-list@python.org> <mcargl$h3k$1@reader1.panix.com> <87egpjapxv.fsf@elektro.pacujo.net> <54e9391b$0$13010$c3e8da3$5496439d@news.astraweb.com> <87r3tiids7.fsf@elektro.pacujo.net> <mailman.18989.1424593399.18130.python-list@python.org> <87mw46ibtq.fsf@elektro.pacujo.net> <mailman.18990.1424595520.18130.python-list@python.org> <87ioeui9zd.fsf@elektro.pacujo.net>
Date Sun, 22 Feb 2015 21:21:17 +1100
Subject Re: Design thought for callbacks
From Chris Angelico <rosuav@gmail.com>
Cc "python-list@python.org" <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.18992.1424600480.18130.python-list@python.org> (permalink)
Lines 24
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1424600480 news.xs4all.nl 2932 [2001:888:2000:d::a6]:44742
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:86093

Show key headers only | View raw

On Sun, Feb 22, 2015 at 8:14 PM, Marko Rauhamaa <marko@pacujo.net> wrote:
>> Helping it along means your program doesn't waste memory. Why such a
>> blanket statement?
>
> Because worrying Python programmers with evil spirits (reference loops)
> leads to awkward coding practices and takes away one of the main
> advantages of Python as a high-level programming language.

Right, and I suppose that, by extension, we should assume that the
Python interpreter can optimize this?

def fib(x):
    if x<2: return x
    return fib(x-2)+fib(x-1)

Just because a computer can, in theory, recognize that this is a pure
function, doesn't mean that we can and should depend on that. If you
want this to be optimized, you either fix your algorithm or explicitly
memoize the function - you don't assume that Python can do it for you.

Even when you write in a high level language, you need to understand
how computers work.

ChrisA

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

Thread

Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-21 08:13 -0500
  Re: Design thought for callbacks Grant Edwards <invalid@invalid.invalid> - 2015-02-21 20:57 +0000
    Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-21 23:57 +0200
      Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-22 13:04 +1100
        Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 13:11 +1100
          Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-22 15:38 +1100
            Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 17:21 +1100
              Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-22 21:32 +1100
                Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 22:14 +1100
                Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-23 00:45 +1100
                Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-23 01:01 +1100
        Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 09:52 +0200
          Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 19:17 +1100
            Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 10:34 +0200
              Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 19:58 +1100
                Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 11:14 +0200
                Re: Design thought for callbacks Chris Angelico <rosuav@gmail.com> - 2015-02-22 21:21 +1100
                Re: Design thought for callbacks Laura Creighton <lac@openend.se> - 2015-02-22 12:28 +0100
                Re: Design thought for callbacks Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-23 00:57 +1100
                Re: Design thought for callbacks Marko Rauhamaa <marko@pacujo.net> - 2015-02-22 16:06 +0200
    Re: Design thought for callbacks Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-22 00:05 -0700
    Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-22 08:21 -0500
      Re: Design thought for callbacks Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-24 18:20 +1300
        Re: Design thought for callbacks random832@fastmail.us - 2015-02-24 00:29 -0500
          Re: Design thought for callbacks Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-25 10:19 +1300
            Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-25 07:50 -0500
              Re: Design thought for callbacks Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-26 18:36 +1300
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-02-26 05:58 -0500
                Re: Design thought for callbacks Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-26 12:54 -0700
                Re: Design thought for callbacks Ethan Furman <ethan@stoneleaf.us> - 2015-02-26 12:00 -0800
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-03-02 06:06 -0500
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-03-02 06:04 -0500
                Re: Design thought for callbacks Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-02 08:34 -0700
                Re: Design thought for callbacks Cem Karan <cfkaran2@gmail.com> - 2015-03-08 14:30 -0400

csiph-web