Thank you Guido.

It'll be nice to see this all come to something.

Thanks to all who contributed to the discussion -- despite this being a pretty simple function, I learned a lot and far more fully appreciate the nuance of all of this.

I'll edit the text as you suggest, and then work on a patch -- I'm sure I'll have questions for Python-dev when I actually do that, but I'll get started on my  own and see how far I get.


On Fri, Feb 27, 2015 at 11:38 AM, Guido van Rossum <> wrote:
I think it's time to accept PEP 485. I've re-read it once more, and it looks like the text is in great shape. (My only recommendation would be to update the Abstract to state that we're specifically adding math.isclose().)

A wording question: "This implementation has a flag that lets the user select which relative tolerance test to apply -- this PEP does not suggest that that be retained, but rather than the weak test be selected." -- I think this was meant to say "... rather *that* the weak test be selected", right? (It would be nice if the sample implementation defaulted to the choice in the PEP.)

However, those are just minor edits, and I hereby approve the PEP. Thanks Chris and everyone else for the fruitful discussion (and thanks especially to Chris for eventually ending the bikeshedding and writing a PEP that explains each of the choices). Congrats!

--Guido van Rossum (


Christopher Barker, Ph.D.

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