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Tue Oct 17 16:25:11 EDT 2017 · https://mail.python.org/pipermail/python-dev/2017-October/149904.html

It takes courage to admit failures like this! I think this is a good call.
It echoes the experiences with Unladen Swallow and Pyston. Despite what
people may think, CPython really isn't slow, given the large set of
constraints on the implementation.

On Tue, Oct 17, 2017 at 1:10 PM, Victor Stinner <victor.stinner at gmail.com>
wrote:

> Hi,
>
> I rejected my own PEP 510 "Specialize functions with guards" that I
> wrote in January 2016:
>
> https://github.com/python/peps/commit/c99fb8bf5b5c16c170e1603a1c66a7
> 4e93a4ae84
>
> "This PEP was rejected by its author since the design didn't show any
> significant speedup, but also because of the lack of time to implement
> the most advanced and complex optimizations."
>
> I stopped working on my FAT Python project almost one year ago:
> https://faster-cpython.readthedocs.io/fat_python.html
>
> Victor
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>

-- 
--Guido van Rossum (python.org/~guido)
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[Python-Dev] PEP 510 (function specialization) rejected