On Sun, Dec 29, 2019 at 10:18 PM Richard Damon <rich...@damon-family.org>
wrote:
> IEEE total_order puts NaN as bigger than infinity, and -NaN as less than
> -inf.
>
You mean like this?
>>> def total_order(x):
... if math.isnan(x):
... return (math.copysign(1, x), x)
... return (0, x)
...
...
>>> nums = [1, 2, float('-inf'), float('nan'), float('inf'), float('-nan')]
>>> nums
[1, 2, -inf, nan, inf, nan]
>>> sorted(nums, key=total_order)
[nan, -inf, 1, 2, inf, nan]
It's a little weird that -nan has a repr of 'nan', but bracketing that, my
implementation is EXACTLY what you describe.
--
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from the bellies of the hungry; books from the hands of the
uneducated; technology from the underdeveloped; and putting
advocates of freedom in prisons. Intellectual property is
to the 21st century what the slave trade was to the 16th.
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