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

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From Terry Reedy <tjreedy@udel.edu>
Subject Re: None versus MISSING sentinel -- request for design feedback
Date Fri, 15 Jul 2011 17:35:29 -0400
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On 7/15/2011 6:19 AM, Steven D'Aprano wrote:

Use None as default. Requiring users to use your special value would be 
a nuisance. They may have data prepared separately from your module.

> Rob Williscroft wrote:

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

This is also a good idea.

> So you think the right API is to allow the caller to specify what counts as
> a missing value at runtime? Are you aware of any other statistics packages
> that do that?

AFAIK, standard feature on major packages. BMDP, SAS and SPSS as I 
remember. Missing values could be specified on a per column basis.

-- 
Terry Jan Reedy

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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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