On Fri, 21 May 2004 15:21:09 -0400
"Tim Peters"
[Armin Rigo] [..] NaN comparison is a red herring not only because Python doesn't have a sane story in any area involving NaNs, but also because the 32 possible 754 comparison predicates can't be mapped onto 6 operator symbols. Note that in C99, the infix C relational operators raise an exception (754's "invalid operation") when applied to a NaN, and C99 adds a pile of new macros for non-exceptional NaN comparison (my favorite is the fetchingly named"islessgreater(x, y)" -- which "is similar to (x) < (y) || (x) > (y); however, islessgreater(x,y) does not raise the invalid exception when x and y are unordered (nor does it evaluate x and y twice)").
Finally, a use for <>. Barry will be so happy ;^) -Casey