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Wed Mar 24 06:36:40 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-March/098790.html

Steven D'Aprano writes:

 > As usual though, NANs are unintuitive:
 > 
 > >>> d = {float('nan'): 1}
 > >>> d[float('nan')] = 2
 > >>> d
 > {nan: 1, nan: 2}
 > 
 > 
 > I suspect that's a feature, not a bug.

I don't see how it can be so.  Aren't all of those entries garbage?
To compute a histogram of results for computations on a series of
cases would you not have to test each result for NaN-hood, then hash
on a proxy such as the string "Nan"?

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[Python-Dev] Mixing float and Decimal -- thread reboot