[Python-Dev] decimal.py: == and != comparisons involving NaNs (original) (raw)
Mark Dickinson dickinsm at gmail.com
Mon Nov 9 13:40:06 CET 2009
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On Mon, Nov 9, 2009 at 12:21 PM, Stefan Krah <stefan-usenet at bytereef.org> wrote:
I see the point, but Decimal("NaN") does not hash:
hash(Decimal("NaN")) Traceback (most recent call last): File "", line 1, in File "/usr/lib/python2.7/decimal.py", line 937, in hash raise TypeError('Cannot hash a NaN value.') TypeError: Cannot hash a NaN value.
I think that may represent an excess of caution. float nans do hash quite happily, and I can't see a good reason for preventing Decimal nans from having a hash.
Mark
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