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Re: None versus MISSING sentinel -- request for design feedback

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From Rob Williscroft <rtw@rtw.me.uk>
Subject Re: None versus MISSING sentinel -- request for design feedback
Date Fri, 15 Jul 2011 07:43:57 +0000 (UTC)
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Steven D'Aprano wrote in news:4e1fd009$0$29986$c3e8da3
$5496439d@news.astraweb.com in gmane.comp.python.general:

> I'm designing an API for some lightweight calculator-like statistics
> functions, such as mean, standard deviation, etc., and I want to support
> missing values. Missing values should be just ignored. E.g.:
> 
> mean([1, 2, MISSING, 3]) => 6/3 = 2 rather than 6/4 or raising an error.

If you can't make your mind up then maybe you shouldn't:

MISSING = MissingObject()
def mean( sequence, missing = MISSING ):
  ...

Rob.

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Thread

None versus MISSING sentinel -- request for design feedback Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-07-15 15:28 +1000
  Re: None versus MISSING sentinel -- request for design feedback Chris Angelico <rosuav@gmail.com> - 2011-07-15 16:08 +1000
    Re: None versus MISSING sentinel -- request for design feedback "bruno.desthuilliers@gmail.com" <bruno.desthuilliers@gmail.com> - 2011-07-15 00:53 -0700
    Re: None versus MISSING sentinel -- request for design feedback Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-07-15 20:46 +1000
      Re: None versus MISSING sentinel -- request for design feedback Chris Angelico <rosuav@gmail.com> - 2011-07-15 21:04 +1000
        Re: None versus MISSING sentinel -- request for design feedback Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-07-15 22:48 +1000
          Re: None versus MISSING sentinel -- request for design feedback Mel <mwilson@the-wire.com> - 2011-07-15 09:16 -0400
            Re: None versus MISSING sentinel -- request for design feedback Ethan Furman <ethan@stoneleaf.us> - 2011-07-15 10:18 -0700
              Re: None versus MISSING sentinel -- request for design feedback Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-07-16 14:24 +1200
                Re: None versus MISSING sentinel -- request for design feedback Ethan Furman <ethan@stoneleaf.us> - 2011-07-16 17:31 -0700
  Re: None versus MISSING sentinel -- request for design feedback Rob Williscroft <rtw@rtw.me.uk> - 2011-07-15 07:43 +0000
    Re: None versus MISSING sentinel -- request for design feedback Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-07-15 20:19 +1000
      Re: None versus MISSING sentinel -- request for design feedback "OKB (not okblacke)" <brenNOSPAMbarn@NObrenSPAMbarn.net> - 2011-07-15 17:40 +0000
      Re: None versus MISSING sentinel -- request for design feedback Terry Reedy <tjreedy@udel.edu> - 2011-07-15 17:35 -0400
  Re: None versus MISSING sentinel -- request for design feedback Cameron Simpson <cs@zip.com.au> - 2011-07-15 17:44 +1000
    Re: None versus MISSING sentinel -- request for design feedback "bruno.desthuilliers@gmail.com" <bruno.desthuilliers@gmail.com> - 2011-07-15 02:58 -0700
    Re: None versus MISSING sentinel -- request for design feedback Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-07-15 20:17 +1000
      Re: None versus MISSING sentinel -- request for design feedback Cameron Simpson <cs@zip.com.au> - 2011-07-15 20:38 +1000
  Re: None versus MISSING sentinel -- request for design feedback "bruno.desthuilliers@gmail.com" <bruno.desthuilliers@gmail.com> - 2011-07-15 00:59 -0700
  Re: None versus MISSING sentinel -- request for design feedback Teemu Likonen <tlikonen@iki.fi> - 2011-07-15 11:28 +0300
    Re: None versus MISSING sentinel -- request for design feedback "bruno.desthuilliers@gmail.com" <bruno.desthuilliers@gmail.com> - 2011-07-15 03:02 -0700
      Re: None versus MISSING sentinel -- request for design feedback Teemu Likonen <tlikonen@iki.fi> - 2011-07-15 13:56 +0300
  Re: None versus MISSING sentinel -- request for design feedback Eric Snow <ericsnowcurrently@gmail.com> - 2011-07-15 11:02 -0600

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