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Re: Class hierarchy problem

References <ktqeho$f5i$1@news.albasani.net> <mailman.235.1375781442.1251.python-list@python.org> <520100F9.4010805@gmail.com> <mailman.254.1375797746.1251.python-list@python.org> <ktr56j$u7i$1@news.albasani.net>
Date 2013-08-06 18:12 +0100
Subject Re: Class hierarchy problem
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.267.1375809159.1251.python-list@python.org> (permalink)

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On Tue, Aug 6, 2013 at 4:36 PM, BrJohan <brjohan@gmail.com> wrote:
> Consider a botanical classification system (somewhat analogous to my
> 'problem' as it effectively is related to classification of entities):
>
> A Domain should know about its Kingdoms,
> a Kingdom should know about its Phylums,
> ...
> a Genus should know about its Species.

I don't believe it's that clear. In some situations it may be best to
work that way; in others, each tier should know only those above it.
Does the generic Widget know about being a PushButton, a ListBox, and
a Slider? No, but the Slider knows what a Widget is.

ChrisA

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Class hierarchy problem BrJohan <brjohan@gmail.com> - 2013-08-06 11:10 +0200
  Re: Class hierarchy problem Chris Angelico <rosuav@gmail.com> - 2013-08-06 10:30 +0100
    Re: Class hierarchy problem Chris Angelico <rosuav@gmail.com> - 2013-08-06 15:02 +0100
      Re: Class hierarchy problem BrJohan <brjohan@gmail.com> - 2013-08-06 17:36 +0200
        Re: Class hierarchy problem Joe Junior <joe.fbs.junior@gmail.com> - 2013-08-06 13:23 -0300
        Re: Class hierarchy problem Jordi Riera <kender.jr@gmail.com> - 2013-08-06 18:13 +0200
        Re: Class hierarchy problem Chris Angelico <rosuav@gmail.com> - 2013-08-06 18:12 +0100
        Re: Class hierarchy problem Terry Reedy <tjreedy@udel.edu> - 2013-08-06 19:13 -0400
        Re: Class hierarchy problem Ben Finney <ben+python@benfinney.id.au> - 2013-08-07 11:58 +1000
  Re: Class hierarchy problem Peter Otten <__peter__@web.de> - 2013-08-06 11:34 +0200
  Re: Class hierarchy problem Steven D'Aprano <steve@pearwood.info> - 2013-08-06 09:36 +0000
  pexpect,  loading an entry field inq1ltd <inq1ltd@inqvista.com> - 2013-08-06 11:05 -0400
  Re: pexpect, loading an entry field "Lakshmipathi.G" <lakshmipathi.g@gmail.com> - 2013-08-06 22:04 +0530
  Re: pexpect, loading an entry field inq1ltd <inq1ltd@inqvista.com> - 2013-08-06 14:03 -0400
  Re: pexpect, loading an entry field "Lakshmipathi.G" <lakshmipathi.g@gmail.com> - 2013-08-07 13:40 +0530

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