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Re: PyWart: Language missing maximum constant of numeric types!

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From Ian Kelly <ian.g.kelly@gmail.com>
Date Fri, 24 Feb 2012 18:26:42 -0700
Subject Re: PyWart: Language missing maximum constant of numeric types!
To Devin Jeanpierre <jeanpierreda@gmail.com>
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On Fri, Feb 24, 2012 at 10:32 AM, Devin Jeanpierre
<jeanpierreda@gmail.com> wrote:
> On Fri, Feb 24, 2012 at 9:25 AM, Neil Cerutti <neilc@norwich.edu> wrote:
>> The only time I've naively pined for such a thing is when
>> misapplying C idioms for finding a minimum value.
>>
>> Python provides an excellent min implementation to use instead.
>
> min can be a little inconvenient. As soon as anything complicated has
> to be done during the min expression, you need to switch to using
> something else for sanity's sake. In that vein, I do actually
> sometimes use float('inf') (for numbers), or a custom max/min object.
>
> ----
>
> Silly and completely nonserious addendum:
>
> Forgive me, I have spoken in error! min is the one true way, for you
> can still do it with a little wrangling, as follows:
>
>    @operator.itemgetter(1)
>    @min
>    @apply
>    def closest_object():
>        for x in xrange(board_width)
>            for y in xrange(board_height):
>                try:
>                    entity = board.get_entity(x, y)
>                except EntityNotFound:
>                    pass
>                else:
>                    yield distance(player.pos, entity.pos), entity

Cute, but what's so terrible about:

    def all_entities():
        for x in xrange(board_width):
            for y in xrange(board_height):
                try:
                    yield board.get_entity(x, y)
                except EntityNotFound:
                    pass

    closest_object = min(all_entities,
        key=lambda e: distance(player.pos, e.pos))

Especially given that all_entities should be reusable in other contexts.

Cheers,
Ian

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Thread

PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-24 05:37 -0800
  Re: PyWart: Language missing maximum constant of numeric types! Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-24 13:55 +0000
    Re: PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-24 06:14 -0800
  Re: PyWart: Language missing maximum constant of numeric types! Neil Cerutti <neilc@norwich.edu> - 2012-02-24 14:25 +0000
    Re: PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-24 07:25 -0800
    Re: PyWart: Language missing maximum constant of numeric types! Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-02-24 12:32 -0500
    Re: PyWart: Language missing maximum constant of numeric types! Ian Kelly <ian.g.kelly@gmail.com> - 2012-02-24 18:26 -0700
  Re: PyWart: Language missing maximum constant of numeric types! Miki Tebeka <miki.tebeka@gmail.com> - 2012-02-24 06:39 -0800
    Re: PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-24 07:18 -0800
  Re: PyWart: Language missing maximum constant of numeric types! Mel Wilson <mwilson@the-wire.com> - 2012-02-24 10:21 -0500
    Re: PyWart: Language missing maximum constant of numeric types! Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-24 15:31 +0000
    Re: PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-24 07:34 -0800
      Re: PyWart: Language missing maximum constant of numeric types! Michael Torrie <torriem@gmail.com> - 2012-02-24 09:23 -0700
        Re: PyWart: Language missing maximum constant of numeric types! Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-24 22:45 +0000
      Re: PyWart: Language missing maximum constant of numeric types! Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-24 16:59 +0000
      Re: PyWart: Language missing maximum constant of numeric types! Michael Torrie <torriem@gmail.com> - 2012-02-24 16:16 -0700
      Re: PyWart: Language missing maximum constant of numeric types! Chris Angelico <rosuav@gmail.com> - 2012-02-25 11:09 +1100
      Re: PyWart: Language missing maximum constant of numeric types! Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-02-25 00:35 +0000
        Re: PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-25 12:25 -0800
      Re: PyWart: Language missing maximum constant of numeric types! MRAB <python@mrabarnett.plus.com> - 2012-02-25 00:37 +0000
      Re: PyWart: Language missing maximum constant of numeric types! Serhiy Storchaka <storchaka@gmail.com> - 2012-02-25 17:32 +0200
  Re: PyWart: Language missing maximum constant of numeric types! Fayaz Yusuf Khan <fayaz.yusuf.khan@gmail.com> - 2012-02-25 06:52 +0530
    Re: PyWart: Language missing maximum constant of numeric types! Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-25 01:50 +0000
      Re: PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-25 12:29 -0800
        Re: PyWart: Language missing maximum constant of numeric types! alex23 <wuwei23@gmail.com> - 2012-02-26 18:32 -0800
          Re: PyWart: Language missing maximum constant of numeric types! Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-27 03:51 +0000
            Re: PyWart: Language missing maximum constant of numeric types! Chris Angelico <rosuav@gmail.com> - 2012-02-27 14:59 +1100
            Re: PyWart: Language missing maximum constant of numeric types! alex23 <wuwei23@gmail.com> - 2012-02-26 22:49 -0800
  Re: PyWart: Language missing maximum constant of numeric types! Wolfgang Meiners <WolfgangMeiners01@web.de> - 2012-02-25 09:18 +0100
    Re: PyWart: Language missing maximum constant of numeric types! MRAB <python@mrabarnett.plus.com> - 2012-02-25 17:54 +0000
      Re: PyWart: Language missing maximum constant of numeric types! Rick Johnson <rantingrickjohnson@gmail.com> - 2012-02-25 12:35 -0800
        Re: PyWart: Language missing maximum constant of numeric types! Wolfgang Meiners <WolfgangMeiners01@web.de> - 2012-02-26 14:16 +0100
          Re: PyWart: Language missing maximum constant of numeric types! Wolfgang Meiners <WolfgangMeiners01@web.de> - 2012-02-26 14:38 +0100
            Re: PyWart: Language missing maximum constant of numeric types! Arnaud Delobelle <arnodel@gmail.com> - 2012-02-26 13:44 +0000
          Re: PyWart: Language missing maximum constant of numeric types! Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-26 13:50 +0000
          Re: PyWart: Language missing maximum constant of numeric types! Neil Cerutti <neilc@norwich.edu> - 2012-02-27 12:25 +0000
        Re: PyWart: Language missing maximum constant of numeric types! Jean-Michel Pichavant <jeanmichel@sequans.com> - 2012-02-27 12:55 +0100
      Re: PyWart: Language missing maximum constant of numeric types! Wolfgang Meiners <WolfgangMeiners01@web.de> - 2012-02-26 12:56 +0100
        Re: PyWart: Language missing maximum constant of numeric types! Chris Angelico <rosuav@gmail.com> - 2012-02-26 23:52 +1100
          Re: PyWart: Language missing maximum constant of numeric types! Wolfgang Meiners <WolfgangMeiners01@web.de> - 2012-02-26 14:32 +0100
        Re: PyWart: Language missing maximum constant of numeric types! Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-26 13:19 +0000

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