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Re: Looking for a good introduction to object oriented programming with Python

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Date Thu, 9 Aug 2012 11:32:00 +1000
Subject Re: Looking for a good introduction to object oriented programming with Python
From Chris Angelico <rosuav@gmail.com>
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On Thu, Aug 9, 2012 at 3:28 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> (As they say: I'll believe that corporations are people when Texas
> executes one.)

If proper excuse you can trump any,
You may wind up a Limited Company
You cannot conveniently blow it up!

-- WS Gilbert, "Utopia, Ltd"

But not every "is-a" relationship needs to be represented as class
inheritance. So what if all your Customers are Persons? Do you
_really_ need a Person base class? In a lot of systems, you don't. If
anything, you might have a generic base class for every entity that
has an Address (which would include corporations), but that's more
likely to want to be composition than inheritance (the customer Has-An
Address rather than the customer Is-An AddressibleEntity). Flat is
better than nested.

Of course, if you don't need an actual use-case, I could invent
several ridiculous base classes. Why not have one for Body, which
would be subclassed by Person and Corporation (after all, a
corporation is a body, that's where the name comes from), but not
Ghost. And then you could have a mixin called Intelligence which is
used by Corporation and Army (everyone knows what Business
Intelligence and Military Intelligence are), sometimes used by Person,
but never used by ClassDesign.

ChrisA

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[newbie] Looking for a good introduction to object oriented programming with Python Jean Dubois <jeandubois314@gmail.com> - 2012-08-04 08:49 -0700
  Re: [newbie] Looking for a good introduction to object oriented programming with Python shearichard@gmail.com - 2012-08-04 17:11 -0700
    Re: Looking for a good introduction to object oriented programming with Python Jean Dubois <jeandubois314@gmail.com> - 2012-08-05 05:38 -0700
    Re: Looking for a good introduction to object oriented programming with Python Jean Dubois <jeandubois314@gmail.com> - 2012-08-05 11:04 -0700
      Re: Looking for a good introduction to object oriented programming with Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-05 19:28 +0100
        Re: Looking for a good introduction to object oriented programming with Python Jean Dubois <jeandubois314@gmail.com> - 2012-08-06 07:56 -0700
          Re: Looking for a good introduction to object oriented programming with Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-06 17:17 +0100
            Re: Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-07 01:12 +0000
              Re: Looking for a good introduction to object oriented programming with Python Ben Finney <ben+python@benfinney.id.au> - 2012-08-07 11:23 +1000
              Re: Looking for a good introduction to object oriented programming with Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-07 08:49 +0100
      Re: Looking for a good introduction to object oriented programming with Python Roy Smith <roy@panix.com> - 2012-08-05 14:39 -0400
      Re: Looking for a good introduction to object oriented programming with Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-05 19:53 +0100
      Re: Looking for a good introduction to object oriented programming with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-05 18:45 -0400
        Re: Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-05 22:51 +0000
          Re: Looking for a good introduction to object oriented programming with Python Roy Smith <roy@panix.com> - 2012-08-05 19:12 -0400
            Re: Looking for a good introduction to object oriented programming with Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-06 00:30 +0100
            Re: Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-06 00:27 +0000
              Re: Looking for a good introduction to object oriented programming with Python Dan Sommers <dan@tombstonezero.net> - 2012-08-05 17:50 -0700
              Re: Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-06 08:48 +0100
              Re: Looking for a good introduction to object oriented programming with Python DJC <djc@news.invalid> - 2012-08-06 11:20 +0200
            Re: Looking for a good introduction to object oriented programming with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-05 20:57 -0400
          Re: Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-06 08:43 +0100
            Re: Looking for a good introduction to object oriented programming with Python Roy Smith <roy@panix.com> - 2012-08-06 09:16 -0400
        Re: Looking for a good introduction to object oriented programming with Python Wolfgang Strobl <news4@mystrobl.de> - 2012-08-06 08:18 +0200
  Re: [newbie] Looking for a good introduction to object oriented programming with Python dncarac@gmail.com - 2012-08-05 11:59 -0700
  Re: [newbie] Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-05 20:46 +0100
    Re: [newbie] Looking for a good introduction to object oriented programming with Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-05 23:11 +0100
      Re: [newbie] Looking for a good introduction to object oriented programming with Python Roy Smith <roy@panix.com> - 2012-08-05 18:53 -0400
    Re: [newbie] Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-06 00:22 +0000
      Re: [newbie] Looking for a good introduction to object oriented programming with Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-06 02:02 +0100
      Re: [newbie] Looking for a good introduction to object oriented programming with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-05 21:14 -0400
        Re: [newbie] Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-06 06:08 +0000
          Re: [newbie] Looking for a good introduction to object oriented programming with Python Paul Rubin <no.email@nospam.invalid> - 2012-08-06 00:25 -0700
      Re: Looking for a good introduction to object oriented programming with Python alex23 <wuwei23@gmail.com> - 2012-08-05 19:44 -0700
        Re: Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-07 19:02 +0000
          Re: Looking for a good introduction to object oriented programming with Python Terry Reedy <tjreedy@udel.edu> - 2012-08-07 18:37 -0400
          Re: Looking for a good introduction to object oriented programming with Python alex23 <wuwei23@gmail.com> - 2012-08-07 17:07 -0700
            Re: Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-08 02:14 +0000
              Re: Looking for a good introduction to object oriented programming with Python Chris Angelico <rosuav@gmail.com> - 2012-08-08 12:24 +1000
              Re: Looking for a good introduction to object oriented programming with Python alex23 <wuwei23@gmail.com> - 2012-08-07 20:20 -0700
      Re: [newbie] Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-06 09:55 +0100
        Re: [newbie] Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-06 10:24 +0100
          Re: [newbie] Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-07 05:35 +0000
            Re: [newbie] Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-07 09:16 +0100
        Re: [newbie] Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-07 05:19 +0000
          Re: [newbie] Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-07 10:19 +0100
            Re: [newbie] Looking for a good introduction to object oriented programming with Python Ben Finney <ben+python@benfinney.id.au> - 2012-08-07 23:12 +1000
              Re: [newbie] Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-07 15:13 +0100
            Re: [newbie] Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-07 14:14 +0000
              Re: [newbie] Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-07 15:34 +0100
                Re: Looking for a good introduction to object oriented programming with Python rusi <rustompmody@gmail.com> - 2012-08-07 08:04 -0700
                Re: Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-07 18:00 +0100
                Re: Looking for a good introduction to object oriented programming with Python Chris Angelico <rosuav@gmail.com> - 2012-08-08 07:57 +1000
                Re: Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-08 10:51 +0100
                Re: Looking for a good introduction to object oriented programming with Python rusi <rustompmody@gmail.com> - 2012-08-08 09:27 -0700
                Re: Looking for a good introduction to object oriented programming with Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-08 17:28 +0000
                Re: Looking for a good introduction to object oriented programming with Python Chris Angelico <rosuav@gmail.com> - 2012-08-09 11:32 +1000
                Re: Looking for a good introduction to object oriented programming with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-08 12:42 -0400
                Re: Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-08 20:31 +0100
                Re: Looking for a good introduction to object oriented programming with Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-08 22:59 -0400
                Re: Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-09 08:29 +0100
                Geneology Packages -- WAS: Looking for a good introduction to object oriented programming with Python Simon Cropper <simoncropper@fossworkflowguides.com> - 2012-08-09 13:51 +1000
                Re: Geneology Packages Ben Finney <ben+python@benfinney.id.au> - 2012-08-09 14:00 +1000
    Re: Looking for a good introduction to object oriented programming with Python rusi <rustompmody@gmail.com> - 2012-08-06 05:19 -0700
      Re: Looking for a good introduction to object oriented programming with Python lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-06 15:27 +0100
        Re: Looking for a good introduction to object oriented programming with Python rusi <rustompmody@gmail.com> - 2012-08-06 09:34 -0700
          Re: Looking for a good introduction to object oriented programming with Python Chris Angelico <rosuav@gmail.com> - 2012-08-07 08:44 +1000
      OT probably but still relevant (was Re: Looking for a good introduction to object oriented programming with Python) lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-06 17:23 +0100
        Re: OT probably but still relevant (was Re: Looking for a good introduction to object oriented programming with Python) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-07 09:44 +0000
          Re: OT probably but still relevant (was Re: Looking for a good introduction to object oriented programming with Python) lipska the kat <lipskathekat@yahoo.co.uk> - 2012-08-07 11:23 +0100

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