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Re: should "self" be changed?

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From Ian Kelly <ian.g.kelly@gmail.com>
Date Thu, 28 May 2015 09:40:32 -0600
Subject Re: should "self" be changed?
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On Thu, May 28, 2015 at 9:01 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Anssi Saari <as@sci.fi>:
>
>> Do you have an example of state pattern using nested classes and
>> python? With a quick look I didn't happen to find one in any language.
>
> Here's an sampling from my mail server:

I think I would be more inclined to use enums. This has the advantages
of not creating a new set of state classes for every connection
instance and that each state is a singleton instance, allowing things
like "if self.state is SMTPConnectionState.IDLE". It could look
something like this:

class SMTPConnectionState(Enum):

    class IDLE:
        @classmethod
        def handle_command(cls, conn, cmd):
            # ...

    class SPF_HELO:
        @classmethod
        def terminate(cls, conn):
            # ...

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Thread

should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-26 09:37 -0700
  Re: should "self" be changed? Laura Creighton <lac@openend.se> - 2015-05-26 18:57 +0200
    Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-26 20:01 -0700
    Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-26 20:15 -0700
  Re: should "self" be changed? Laurent Pointal <laurent.pointal@free.fr> - 2015-05-26 18:59 +0200
  Re: should "self" be changed? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-26 18:28 +0100
    Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-26 19:48 -0700
      Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-26 20:17 -0700
        Re: should "self" be changed? Ben Finney <ben+python@benfinney.id.au> - 2015-05-27 14:39 +1000
          Re: should "self" be changed? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-27 15:47 +1000
            Re: should "self" be changed? Ben Finney <ben+python@benfinney.id.au> - 2015-05-27 21:29 +1000
              Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-27 05:40 -0700
                Re: should "self" be changed? Todd <toddrjen@gmail.com> - 2015-05-27 15:00 +0200
                Re: should "self" be changed? Grant Edwards <invalid@invalid.invalid> - 2015-05-27 14:19 +0000
                Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-30 16:18 -0700
            Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-30 16:10 -0700
          Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-30 16:13 -0700
  Re: should "self" be changed? Chris Angelico <rosuav@gmail.com> - 2015-05-27 03:31 +1000
  Re: should "self" be changed? random832@fastmail.us - 2015-05-26 14:11 -0400
  Re: should "self" be changed? Marko Rauhamaa <marko@pacujo.net> - 2015-05-26 22:46 +0300
    Re: should "self" be changed? Ned Batchelder <ned@nedbatchelder.com> - 2015-05-26 13:04 -0700
      Re: should "self" be changed? Marko Rauhamaa <marko@pacujo.net> - 2015-05-26 23:36 +0300
        Re: should "self" be changed? Anssi Saari <as@sci.fi> - 2015-05-28 17:07 +0300
          Re: should "self" be changed? Marko Rauhamaa <marko@pacujo.net> - 2015-05-28 18:01 +0300
            Re: should "self" be changed? Ian Kelly <ian.g.kelly@gmail.com> - 2015-05-28 09:40 -0600
              Re: should "self" be changed? Marko Rauhamaa <marko@pacujo.net> - 2015-05-28 19:59 +0300
                Re: should "self" be changed? Chris Angelico <rosuav@gmail.com> - 2015-05-29 03:06 +1000
                Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-30 16:39 -0700
            Re: should "self" be changed? Steven D'Aprano <steve@pearwood.info> - 2015-05-29 12:00 +1000
              Re: should "self" be changed? Steven D'Aprano <steve@pearwood.info> - 2015-05-29 15:46 +1000
              Re: should "self" be changed? Steven D'Aprano <steve@pearwood.info> - 2015-06-03 02:50 +1000
                Re: should "self" be changed? "Dr. BigCock" <dreamingforward@gmail.com> - 2015-06-02 10:16 -0700
                Re: should "self" be changed? Marko Rauhamaa <marko@pacujo.net> - 2015-06-02 20:19 +0300
                Re: should "self" be changed? "Dr. Bigcock" <dreamingforward@gmail.com> - 2015-06-02 11:02 -0700
                Re: should "self" be changed? Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-02 19:39 -0600
                Re: should "self" be changed? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-03 17:05 +1000
    Re: should "self" be changed? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-27 15:20 +1000
  Re: should "self" be changed? garabik-news-2005-05@kassiopeia.juls.savba.sk - 2015-05-26 20:26 +0000
    Re: should "self" be changed? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-26 21:45 +0100
      Re: should "self" be changed? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-27 15:23 +1000
        Re: should "self" be changed? Chris Angelico <rosuav@gmail.com> - 2015-05-27 16:32 +1000
          Re: should "self" be changed? Marko Rauhamaa <marko@pacujo.net> - 2015-05-27 10:39 +0300
            Re: should "self" be changed? Chris Angelico <rosuav@gmail.com> - 2015-05-27 18:20 +1000
            Re: should "self" be changed? zipher <dreamingforward@gmail.com> - 2015-05-30 16:15 -0700
        Re: should "self" be changed? Terry Reedy <tjreedy@udel.edu> - 2015-05-27 17:59 -0400
    Re: should "self" be changed? Vito De Tullio <vito.detullio@gmail.com> - 2015-05-26 23:17 +0200
    Re: should "self" be changed? Tim Chase <python.list@tim.thechases.com> - 2015-05-26 16:10 -0500
  Re: should "self" be changed? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-27 15:17 +1000

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