Peter Maas wrote:
> As far as I know NaN is th only value that yields false when compared
> to itself. This leads to
>
> def isNaN(x):
> return (x == x) == False
That is not portable:
Python 2.3.3 (#1, Jan 3 2004, 13:57:08)
[GCC 3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> nan = float("nan")
>>> nan != nan
False
Peter