[Python-Dev] Why is nan != nan? (original) (raw)
Alexander Belopolsky alexander.belopolsky at gmail.com
Wed Mar 24 23:36:49 CET 2010
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On Wed, Mar 24, 2010 at 6:31 PM, Mark Dickinson <dickinsm at gmail.com> wrote: ..
Neither is necessary, because Python doesn't actually use == as the equivalence relation for containment testing: the actual equivalence relation is: x equivalent to y iff id(x) == id(y) or x == y. This restores the missing reflexivity (besides being a useful optimization).
No, it does not:
float('nan') in [float('nan')] False
It would if NaNs were always interned, but they are not.
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