Re: Classic OOP in Python

References	<23b2fae3-91d5-486b-9898-78b34bee486f@googlegroups.com> <f0c76343-7230-499c-ba30-33d7f6513503@googlegroups.com> <mlu8hh$ntr$1@speranza.aioe.org>
Date	2015-06-18 21:43 +1000
Subject	Re: Classic OOP in Python
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.595.1434627811.13271.python-list@python.org> (permalink)

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On Thu, Jun 18, 2015 at 9:03 PM, Fabien <fabien.maussion@gmail.com> wrote:
> Would you consider the following kind of program "unpythonic"?
>
> class MovingObject(object):
>     """Great doc about what a moving object is"""
>
>     def move(self):
>         """Great doc about move"""
>         raise NotImplementedError()
>
> class Dog(MovingObject):
>     def move(self):
>         print "Dog is moving"
>
> class Car(MovingObject):
>     def move(self):
>         print "Car is moving"
>
> (Disclaimer: I learned OOP with Java)

Now try extending the concept to two, three, or four such interfaces.
Files can be moved, opened, copied, and unlinked. Should they share
any sort of interface with dogs, boxes, handwriting, and railway
carriages? It's much better to simply define the attributes of each
object separately; most non-trivial cases don't involve simple methods
with no additional arguments, and the chances of an incompatibility
(or worse, a forced compatibility) go up.

ChrisA

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Classic OOP in Python "Jason P." <suscricions@gmail.com> - 2015-06-17 12:21 -0700
  Re: Classic OOP in Python Skip Montanaro <skip.montanaro@gmail.com> - 2015-06-17 14:38 -0500
  Re: Classic OOP in Python Ned Batchelder <ned@nedbatchelder.com> - 2015-06-17 12:44 -0700
    Re: Classic OOP in Python Marko Rauhamaa <marko@pacujo.net> - 2015-06-17 23:39 +0300
      Re: Classic OOP in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-06-17 22:07 +0100
      Re: Classic OOP in Python Ned Batchelder <ned@nedbatchelder.com> - 2015-06-17 14:14 -0700
        Re: Classic OOP in Python Laura Creighton <lac@openend.se> - 2015-06-18 00:33 +0200
          Re: Classic OOP in Python Ned Batchelder <ned@nedbatchelder.com> - 2015-06-17 15:55 -0700
        Re: Classic OOP in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-06-18 11:50 +0100
        Re: Classic OOP in Python Laura Creighton <lac@openend.se> - 2015-06-19 01:01 +0200
        Re: Classic OOP in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-06-20 23:52 +0100
        Re: Classic OOP in Python Laura Creighton <lac@openend.se> - 2015-06-21 10:26 +0200
      Re: Classic OOP in Python sohcahtoa82@gmail.com - 2015-06-17 14:33 -0700
        Re: Classic OOP in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-06-17 22:49 +0100
        Re: Classic OOP in Python Laura Creighton <lac@openend.se> - 2015-06-18 00:22 +0200
        Re: Classic OOP in Python Marco Buttu <marco.buttu@gmail.com> - 2015-06-18 11:00 +0200
      Re: Classic OOP in Python Laura Creighton <lac@openend.se> - 2015-06-18 00:09 +0200
      Re: Classic OOP in Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-06-17 23:27 +0100
      Re: Classic OOP in Python Steven D'Aprano <steve@pearwood.info> - 2015-06-18 08:58 +1000
        Re: Classic OOP in Python Cousin Stanley <cousinstanley@gmail.com> - 2015-06-18 08:10 -0700
      Re: Classic OOP in Python Terry Reedy <tjreedy@udel.edu> - 2015-06-17 19:46 -0400
      Re: Classic OOP in Python Chris Angelico <rosuav@gmail.com> - 2015-06-18 10:07 +1000
      Re: Classic OOP in Python "Jason P." <suscricions@gmail.com> - 2015-06-18 04:24 -0700
    Re: Classic OOP in Python "Jason P." <suscricions@gmail.com> - 2015-06-18 04:21 -0700
      Re: Classic OOP in Python Ned Batchelder <ned@nedbatchelder.com> - 2015-06-18 04:54 -0700
    Re: Classic OOP in Python "Jason P." <suscricions@gmail.com> - 2015-06-18 04:22 -0700
  Re: Classic OOP in Python sohcahtoa82@gmail.com - 2015-06-17 14:16 -0700
    Re: Classic OOP in Python Fabien <fabien.maussion@gmail.com> - 2015-06-18 13:03 +0200
      Re: Classic OOP in Python Marko Rauhamaa <marko@pacujo.net> - 2015-06-18 14:25 +0300
      Re: Classic OOP in Python Chris Angelico <rosuav@gmail.com> - 2015-06-18 21:43 +1000

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