Terry Reedy wrote:

I think there have been vague proposals for a float method, but "a - b < delta" is shorter than "a.almost_equat(b, abs=delta)" and probably easier to understand.

what if a < b? or if a or b (or both) are NaN/+Inf/-Inf? Or... There are many pitfalls comparing floats, isn't better to delegate these checks in a function? -- By ZeD

On 12 Aug 2014 04:16, "Terry Reedy" wrote:

On 8/11/2014 12:25 PM, Kevin Davies wrote:

...

Erik Bray has created a nifty addition to doctest to compare floating point numbers using a `+FLOAT_CMP` flag.

The problem with a simple flag is that almost_equal should sometimes be

"a - b < delta" is shorter than "a.almost_equat(b, abs=delta)" and

absolute and sometimes relative and in both cases a parameter in needed. I think there have been vague proposals for a float method, but probably easier to understand. For more formal tests, we already have unittest.TestCase.assertAlmostEqual. This sounds like a reasonable flag for doctest's original purpose of checking that examples in docs are showing sensible answers. Cheers, Nick.

...

It is implemented within

Astropy (http://www.astropy.org/) and the related issue is https://github.com/astropy/astropy/issues/2662.

The related issue is applying flags to a block of test with a Sphinx

directive.

...

According to Erik, it may need some tweaks, but I think it would be a really useful feature to make available in the doctest package itself.

Erik would have to offer his code.

-- Terry Jan Reedy

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