[Python-Dev] PyObject_RichCompareBool identity shortcut (original) (raw)

Isaac Morland ijmorlan at uwaterloo.ca
Wed Apr 27 18:40:04 CEST 2011

On Wed, 27 Apr 2011, Antoine Pitrou wrote:

Isaac Morland <ijmorlan at uwaterloo.ca> wrote:

Python could also provide IEEE-754 equality as a function (perhaps in "math"), something like: def ieeeequal (a, b): return a == b and not isnan (a) and not isnan (b) +1 (perhaps call it math.eq()).

Alexander Belopolsky pointed out to me (thanks!) that isnan is implemented in C so my caveat about the implementation of isnan is not an issue. But then that made me realize the ieee_equal (or just "eq" if that's preferable) probably ought to be implemented in C using a floating point comparison - i.e., use the processor implementation of the comparison operation..

Isaac Morland CSCF Web Guru DC 2554C, x36650 WWW Software Specialist

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