None versus MISSING sentinel -- request for design feedback

Chris Angelico rosuav at
Fri Jul 15 07:04:10 EDT 2011

On Fri, Jul 15, 2011 at 8:46 PM, Steven D'Aprano
<steve+comp.lang.python at> wrote:
> In general, you have missing values in statistics because somebody wouldn't
> answer a question, and the Ethics Committee frowns on researchers torturing
> their subjects to get information. They make you fill out forms.

Which, then, is in support of an explicit "User chose not to answer
this question" MISSING value.


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