[Python-Dev] decimal.py: == and != comparisons involving NaNs

[Antoine Pitrou]

Stefan Krah <stefan-usenet <at> bytereef.org> writes:
> 
> I see the point, but Decimal("NaN") does not hash:

Ok but witness again:

>>> L = [1, 2, Decimal("NaN"), 3]
>>> 3 in L
True
>>> class H(object):
...   def __eq__(self, other): raise ValueError
... 
>>> L = [1, 2, H(), 3]
>>> 3 in L
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in __eq__
ValueError


(NB: interestingly, float("nan") does hash)

Regards

Antoine.