Question about None
research at johnohagan.com
Sun Jun 14 05:17:45 CEST 2009
On Sat, 13 Jun 2009, John Yeung wrote:
> On Jun 13, 5:22 pm, "Rhodri James" <rho... at wildebst.demon.co.uk>
> > Such an understanding would be clearly wrong in the context
> > in which we were talking (and denotational semantics is a
> > branch of category theory, which is not specific to computer
> > science if you don't mind). If None is nothing, then it can't
> > be a string, int, float or anything else, because they're all
> > something.
> I appreciate your explanation, and your politeness.
> And I accept your answer, as well as Steven's and Paul's for that
> matter. I still think it is understandable (and people may choose to
> understand in a condescending way, if they wish) that someone might
> not get the difference between what you are saying and the statement
> that all elements of the empty set are floats. I mean, what's in the
> empty set? Nothing. But you've said that floats are something. How
> is it that nothing is something?
Also accepting that Python's implementation of None and all() are well-defined
and practical, I would add that philosophically these matters of emptiness and
nothingness are far from concluded. Bertrand Russell, for one, would have
disputed the behaviour of all(), although he may have appreciated its
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