[Python-ideas] Fwd: Re: PEP 485: A Function for testing approximate equality

[Kyle Lahnakoski]

Chris Barker,

If `isclose()` function is to be part of the standard library I would
ask that the `rel_tol` and `abs_tol` both accept -log10 scaled  values:

Instead of
>    isclose(a, b, rel_tol=1e-9, abs_tol=0.0)

we have
>    isclose(a, b, rel_tol=9, abs_tol=-INF)

`rel_tol` can be understood in terms of number of significant digits.  
`abs_tol` is understood in terms of fixed decimal digits.


Thanks for noticing the ubiquitous need for such function.




>
> On Thursday, February 5, 2015 at 12:14:25 PM UTC-5, Chris Barker -
> NOAA Federal wrote:
>
>     Hi folks,
>
>     Time for Take 2 (or is that take 200?)
>
>


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