Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed2a.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.152 X-Spam-Level: * X-Spam-Evidence: '*H*': 0.70; '*S*': 0.00; 'problem?': 0.07; 'additionally': 0.09; 'extends': 0.09; '>>': 0.16; 'appropriate': 0.16; 'wrote:': 0.18; 'feb': 0.22; 'email addr:gmail.com>': 0.22; 'looks': 0.24; '>': 0.26; 'suggested': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'wonder': 0.29; 'involving': 0.30; 'message-id:@mail.gmail.com': 0.30; 'work.': 0.31; 'url:python': 0.33; 'ago': 0.33; 'framework': 0.33; 'anybody': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'url:org': 0.36; 'effort': 0.37; 'sometimes': 0.38; 'url:library': 0.38; 'to:addr:python-list': 0.38; 'does': 0.39; 'to:addr:python.org': 0.39; 'days': 0.60; 'solve': 0.60; 'url:3': 0.61; "you're": 0.61; 'talking': 0.65; 'determine': 0.67; '26,': 0.68; 'reads': 0.68; 'subject:Design': 0.78; '2015': 0.84; '4:00': 0.84; 'subject:thought': 0.84 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:to :content-type; bh=0/udJW3qwXPANxyQvkQAdYeu7imyevOb79svcV/geFs=; b=A7dWIn/orxjXMQ0BXR+owknZmNX6V1NXt5Vttu4O4LK9U1iqpNYxp6ClgmMf7OZq6a SUxZGavCZlokfz/INI7v8XYor8PsYLrFqO0xijvkreNsTKRcrP8R8yZ0oapnMhtaIhXJ p/0YHbypRH4rA0bRWdaP42o6moBQd3ubVR+92wCJAsbIPbLF/BcqC93nfLQjXhu5ZS5D lisbPeSJ8NN8+0IgKQ/1jOWOAK6BlBZc0AK0KKFcJXJtuuIqIeZ46iEbCEajIeAqTZNG HEkxM9nctTAJlB3E2OgZHTf7LCnSrawaXl5V1z5gVr1BjwEbRRm2uPkwtYw5Dl11NlXF LlQw== MIME-Version: 1.0 X-Received: by 10.70.37.41 with SMTP id v9mr18160768pdj.6.1424980448484; Thu, 26 Feb 2015 11:54:08 -0800 (PST) In-Reply-To: References: <33677AE8-B2FA-49F9-9304-C8D93784255D@gmail.com> Date: Thu, 26 Feb 2015 12:54:08 -0700 Subject: Re: Design thought for callbacks From: Ian Kelly To: Python Content-Type: multipart/alternative; boundary=047d7bfea62a71cdb80510031d12 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 59 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1424980458 news.xs4all.nl 2947 [2001:888:2000:d::a6]:35101 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:86536 --047d7bfea62a71cdb80510031d12 Content-Type: text/plain; charset=UTF-8 On Feb 26, 2015 4:00 AM, "Cem Karan" wrote: > > > On Feb 26, 2015, at 12:36 AM, Gregory Ewing wrote: > > > Cem Karan wrote: > >> I think I see what you're talking about now. Does WeakMethod > >> (https://docs.python.org/3/library/weakref.html#weakref.WeakMethod) solve > >> this problem? > > > > Yes, that looks like it would work. > > > Cool! Sometimes I wonder whether anybody reads my posts. I suggested a solution involving WeakMethod four days ago that additionally extends the concept to non-method callbacks (requiring a small amount of extra effort from the client in those cases, but I think that is unavoidable. There is no way that the framework can determine the appropriate lifetime for a closure-based callback.) --047d7bfea62a71cdb80510031d12 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Feb 26, 2015 4:00 AM, "Cem Karan" <cfkaran2@gmail.com> wrote:
>
>
> On Feb 26, 2015, at 12:36 AM, Gregory Ewing <greg.ewing@canterbury.ac.nz> wrote:
>
> > Cem Karan wrote:
> >> I think I see what you're talking about now.=C2=A0 Does W= eakMethod
> >> (https://docs.python.org/3/library/weakref.html#weakref.We= akMethod) solve
> >> this problem?
> >
> > Yes, that looks like it would work.
>
>
> Cool!

Sometimes I wonder whether anybody reads my posts. I suggest= ed a solution involving WeakMethod four days ago that additionally extends = the concept to non-method callbacks (requiring a small amount of extra effo= rt from the client in those cases, but I think that is unavoidable. There i= s no way that the framework can determine the appropriate lifetime for a cl= osure-based callback.)

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