On Tue, 08 Jul 2014 20:31:25 +0300, Marko Rauhamaa wrote: > Thus, dict operations never test NaN == NaN
You're assuming that there is only one NAN instance. That is not correct:
py> a = float('nan')
py> b = float('nan')
py> a is b
False
py> a in {b: None}
False
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Steven
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