Groups > comp.lang.python > #52082

Re: Class hierarchy problem

From	Terry Reedy <tjreedy@udel.edu>
Subject	Re: Class hierarchy problem
Date	2013-08-06 19:13 -0400
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On 8/6/2013 11:36 AM, BrJohan 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.

As some already said, 'a domain' is an instance of Domain (or possibly 
generic Taxon). We have on Earth one instance of 'Life'.
>
> Of course it is possible to implement such a decision tree as a
> 'factory'. However, I would rather prefer to encapsulate those decisions
> at the class level where they 'belong'.

Each instance could have a .classify function that assigns instances to 
sub-instance. The master classifier function would only know how to use 
the .classify functions and have no specific content knowledge in itself.

-- 
Terry Jan Reedy

Thread

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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