[Python-Dev] PyObject_RichCompareBool identity shortcut

[Alexander Belopolsky]

On Thu, Apr 28, 2011 at 1:40 AM, Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
..
> The Pythonic thing to do (in the Python 3 world at least) would
> be to regard NaNs as non-comparable and raise an exception.

As I mentioned in a previous post, I agree in case of <, <=,  >, or >=
comparisons, but == and  != are a harder case because you don't want,
for example:

>>> [1,2,float('nan'),3].index(3)
3

to raise an exception.