[Python-ideas] Way to check for floating point "closeness"?

[Neil Girdhar]

You might be interested in my question:

http://stackoverflow.com/questions/4028889/floating-point-equality-in-python

On Monday, January 12, 2015 at 2:58:30 PM UTC-5, Chris Barker wrote:
>
> Now that we're talking about floating point conveniences (math.nan, 
> linspace):
>
> What about putting an
>
> almost_equal(x,y,tol=1e14)
>
> (or close(), or...) in the math module.
>
> AFAICT, in the standard library, there is only:
>
> unittest.TestCase.assertAlmostEqual
>
> but it:
>
> A) is buried in the unittest.TestCase class
>
> B) is an assertion, so you can't use it as a general test (easily)
>
> C) uses number of decimal digits or an absolute delta, but does not 
> provide a significant figures comparison, which is most likely what's 
> wanted (and a bit harder to write yourself)
>
> numpy provides allclose() (and isclose() ), which is pretty much what I'm 
> suggesting.
>
> Anyone else think this would be a good idea to add to the stdlib? 
>
> -Chris
>  
>
> -- 
>
> Christopher Barker, Ph.D.
> Oceanographer
>
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>  
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