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Re: Adding an interface to existing classes

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On 12/22/2011 3:21 AM, Spencer Pearson wrote:
> I'm writing a geometry package, with Points and Lines and Circles and
> so on, and eventually I want to be able to draw these things on the
> screen. I have two options so far for how to accomplish this, but
> neither of them sits quite right with me, and I'd like the opinion of
> comp.lang.python's wizened elders.
>
> Option 1. Subclassing.
> The most Pythonic way would seem to be writing subclasses for the
> things I want to display, adding a ".draw(...)" method to each one,
> like this:

> Option 2. A "draw" function, with a function dictionary.

Option 3? Add a draw method to existing classes, rather than subclassing?

-- 
Terry Jan Reedy

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Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2011-12-22 00:21 -0800
  Re: Adding an interface to existing classes Terry Reedy <tjreedy@udel.edu> - 2011-12-22 18:13 -0500
    Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2011-12-24 15:49 -0800
      Re: Adding an interface to existing classes Terry Reedy <tjreedy@udel.edu> - 2011-12-24 20:58 -0500
        Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2012-01-04 23:55 -0800
  Re: Adding an interface to existing classes Ian Kelly <ian.g.kelly@gmail.com> - 2011-12-24 18:16 -0700
    Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2012-01-04 23:54 -0800
  Re: Adding an interface to existing classes Rick Johnson <rantingrickjohnson@gmail.com> - 2011-12-24 17:24 -0800
    Re: Adding an interface to existing classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 12:10 +0000
      Re: Adding an interface to existing classes Chris Angelico <rosuav@gmail.com> - 2011-12-25 23:32 +1100
        Re: Adding an interface to existing classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 13:27 +0000
          Re: Adding an interface to existing classes Chris Angelico <rosuav@gmail.com> - 2011-12-26 00:37 +1100
            Re: Adding an interface to existing classes Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-12-25 13:46 +0000
              Re: Adding an interface to existing classes Chris Angelico <rosuav@gmail.com> - 2011-12-26 00:55 +1100
              Re: Adding an interface to existing classes Spencer Pearson <speeze.pearson@gmail.com> - 2012-01-04 23:56 -0800

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