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Wed Apr 27 18:40:04 CEST 2011 · https://mail.python.org/pipermail/python-dev/2011-April/110958.html

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 ieee_equal (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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