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Re: list equal to subclass of list?

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Date Thu, 12 May 2011 18:04:20 -0700
From Ethan Furman <ethan@stoneleaf.us>
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Subject Re: list equal to subclass of list?
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Steven D'Aprano wrote:
> On Thu, 12 May 2011 09:43:23 -0700, Ethan Furman wrote:
> 
>> MyList is a list -- just a more specific kind of list -- as can be seen
>> from its mro; this is analogous to a square (2 sets of parallel lines
>> joined at 90 degree angles, both sets being the same length) also being
>> a rectangle (2 sets of parallel lines joined at 90 degree angles).
> 
> Possibly the worst analogy ever! *wink*
> 
> http://en.wikipedia.org/wiki/Circle-ellipse_problem
> 
> Also known as the square-rectangle problem.
> 
> A better analogy might be, Lassie is a dog, and Flipper is a dolphin, so 
> they are different types of animal. But both dogs and dolphins are 
> mammals, so in that sense, Lassie and Flipper are both mammals and 
> therefore the same type of animal. It depends on what you mean by "type".

I thought about using the mammal analogy instead, but geometry seemed 
simpler.  *sigh*  Oh, well, can't win 'em all!

~Ethan~

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Thread

list equal to subclass of list? Roy Smith <roy@panix.com> - 2011-05-12 08:23 -0400
  Re: list equal to subclass of list? Ethan Furman <ethan@stoneleaf.us> - 2011-05-12 09:43 -0700
    Re: list equal to subclass of list? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-13 00:18 +0000
      Re: list equal to subclass of list? Ethan Furman <ethan@stoneleaf.us> - 2011-05-12 18:04 -0700
    Re: list equal to subclass of list? Roy Smith <roy@panix.com> - 2011-05-12 21:53 -0400
  Re: list equal to subclass of list? Ethan Furman <ethan@stoneleaf.us> - 2011-05-12 11:29 -0700
    Re: list equal to subclass of list? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-05-12 22:40 +0200
    Re: list equal to subclass of list? Roy Smith <roy@panix.com> - 2011-05-12 13:49 -0700
      Re: list equal to subclass of list? Ethan Furman <ethan@stoneleaf.us> - 2011-05-12 14:48 -0700

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