Re: Design thought for callbacks

From	Marko Rauhamaa <marko@pacujo.net>
Newsgroups	comp.lang.python
Subject	Re: Design thought for callbacks
Date	2015-02-22 09:52 +0200
Organization	A noiseless patient Spider
Message-ID	<87r3tiids7.fsf@elektro.pacujo.net> (permalink)
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Steven D'Aprano <steve+comp.lang.python@pearwood.info>:

> Marko Rauhamaa wrote:
>> Grant Edwards <invalid@invalid.invalid>:
>>> the polite thing to do is to delete references to it when you're done
>>> with it.
>> 
>> I disagree with that recommendation. You should do the natural thing and
>> not care who holds references to who.
>
> I don't understand this. What is "the natural thing" if not to delete
> references to an object when you are done with it? Normally you just let
> things go out of scope, but if that won't happen, you have to take active
> steps, such as calling del or setting the reference to None.

Obviously, if you are hoarding objects in a collection, you're going to
land in trouble.

What I mean, though, is that you shouldn't think you need to create
object destructors where you routinely set all members to None.

Marko

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

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