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Re: First attempt at a Python prog (Chess)

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On 15 February 2013 11:36, Tim Golden <mail@timgolden.me.uk> wrote:
> On 15/02/2013 11:22, Oscar Benjamin wrote:
>> Why not make board a list of lists. Then you can do:
>>
>> for row in board:
>>     for piece in row:
>>
>> rather than using range().
>>
>> Or perhaps you could have a dict that maps position tuples to pieces,
>> e.g.: {(1, 2): 'k', ...}
>
> I'm laughing slightly here because, at the monthly London Python
> Dojo, we often find ourselves implementing board-game mechanics
> of one sort or another: Boggle, Battleships, Sliding block,
> Connect 4, Noughts-and-Crosses, even things like Game of Life
> (which has a board of sorts).
>
> And the "how shall we represent the board?" question is pretty
> much the first thing any team asks themselves. And you always
> get someone in favour of lists of lists, someone for one long
> list,

I always get confused when doing this about which of my coordinates
needs to be multiplied (i.e. whether I am in Fortran or C order).

> someone who likes a string, someone (me) who likes a sparse
> dict keyed on coords,

Clearly better than the others.

> someone else likes nested defaultdicts,
> and occasionally more outlandish schemes.
>
> We even went to the extent of having a Dojo a few months back
> which was solely about implementing the ideal board for varying
> characteristics, but we didn't come to any conclusions :)

In this case the innermost loop of the program is over the pieces on
the board. Clearly you want a data structure that allows you to
iterate directly over them. (Actually since that loop is to calculate
the score I would replace it with a function that computes the change
in score as a result of each move).

> (Also I seem to remember that the OP was advised earlier precisely
> to abandon lists of lists in favour of something else).

Actually the suggestion was for the list of lists (instead of a flat list).


Oscar

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First attempt at a Python prog (Chess) Chris Hinsley <chris.hinsley@gmail.com> - 2013-02-13 23:25 +0000
  Re: First attempt at a Python prog (Chess) Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-13 23:55 +0000
    Re: First attempt at a Python prog (Chess) Chris Hinsley <chris.hinsley@gmail.com> - 2013-02-14 01:31 +0000
  Re: First attempt at a Python prog (Chess) Tim Roberts <timr@probo.com> - 2013-02-13 22:05 -0800
    Re: First attempt at a Python prog (Chess) Chris Hinsley <chris.hinsley@gmail.com> - 2013-02-14 17:48 +0000
      Re: First attempt at a Python prog (Chess) Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-14 11:30 -0700
      Re: First attempt at a Python prog (Chess) Tim Roberts <timr@probo.com> - 2013-02-18 20:15 -0800
        Re: First attempt at a Python prog (Chess) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-19 06:24 +0000
        Re: First attempt at a Python prog (Chess) Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-19 12:41 -0700
  Re: First attempt at a Python prog (Chess) jkn <jkn_gg@nicorp.f9.co.uk> - 2013-02-14 13:14 -0800
    Re: First attempt at a Python prog (Chess) Chris Hinsley <chris.hinsley@gmail.com> - 2013-02-14 22:13 +0000
      Re: First attempt at a Python prog (Chess) Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-14 22:09 -0500
  Re: First attempt at a Python prog (Chess) Rick Johnson <rantingrickjohnson@gmail.com> - 2013-02-14 21:05 -0800
  Re: First attempt at a Python prog (Chess) Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-15 11:22 +0000
    Re: First attempt at a Python prog (Chess) Neil Cerutti <neilc@norwich.edu> - 2013-02-15 16:17 +0000
      Re: First attempt at a Python prog (Chess) MRAB <python@mrabarnett.plus.com> - 2013-02-15 17:52 +0000
        Re: First attempt at a Python prog (Chess) Neil Cerutti <neilc@norwich.edu> - 2013-02-19 21:10 +0000
      Re: First attempt at a Python prog (Chess) Matt Jones <matt.walker.jones@gmail.com> - 2013-02-15 12:03 -0600
  Re: First attempt at a Python prog (Chess) Tim Golden <mail@timgolden.me.uk> - 2013-02-15 11:36 +0000
  Re: First attempt at a Python prog (Chess) Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-15 13:11 +0000
  Re: First attempt at a Python prog (Chess) Tim Golden <mail@timgolden.me.uk> - 2013-02-15 15:36 +0000
    Re: First attempt at a Python prog (Chess) Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2013-02-15 18:48 +0200
  Re: First attempt at a Python prog (Chess) Chris Angelico <rosuav@gmail.com> - 2013-02-16 02:49 +1100
  Re: First attempt at a Python prog (Chess) Tim Golden <mail@timgolden.me.uk> - 2013-02-15 17:37 +0000
  Re: First attempt at a Python prog (Chess) Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-15 13:41 -0500
  Re: First attempt at a Python prog (Chess) Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-16 14:39 +0000

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