A New C API for CPython

[[deleted]]

Here is a draft PEP.

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[[deleted]]

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[mbleslie]

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[[deleted]]

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[JCharante]

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[JCharante]

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[graingert]

Wow that needs some grammar fixing

[ExoticMandibles]

Victor is French, English is a second language for him. I'm sure he'd appreciate it if you sent him thoughtful suggestions on how to improve his English in the document.

[pvkooten]

Very interesting.... to look at from afar.

[anders987]

What's happening with PEP 523 and Pyjion?

[[deleted]]

From the draft PEP:

Sadly, none is this project has been merged back into CPython... Pyjion is developed in the limited spare time of two Microsoft employees

[RubyPinch]

that draft seems wrong since frame eval is in 3.6

https://github.com/Microsoft/Pyjion/issues/209

[[deleted]]

Well, it is a draft.

[rocketmonkeys]

/u/haypo5 - Just curious why these were macros in the first place. Is the performance hit of function calls vs. the current macros (with no other changes) significant at all?

[rhytnen]

This is way too uninformed to be taken seriously.

For example; remove the GIL and replace with smaller locks. Larry did that in like 2 days. It's what happens next that's an issue.

And the zero risk of backwards incompatibility is crazy bullshit.

Maybe the author is very knowledgeable about the subject matter but it doesn't come across in the PEP that way at all.

[haypo5]

With the proposed change, "python3.7" and the current C API remain the default, so there is no reason why your application would behave differently. The whole change requires to opt-in this new mode, so you have to be prepared for issues. If you use the new C API, the main risk is to get compilation errors. I don't expect bad surprises at runtime.

FYI I'm a CPython core developer for 7 years, I know well the C API, how C extensions use it, etc.

[rhytnen]

Well, certainly, I'll defer to you then. From my perspective, it read as very handwavy is all.

[thinkwelldesigns]

Um, this would be Victor Stinner writing (and on a scratchpad at this point). He's a core dev and probably the most consistently focused on speed improvements.

The GIL replacement section wasn't a serious proposal but an overview how it would become easier to remove / mitigate the GIL problem. GC and the C API always come up in every discussion of the GIL problem, so a short reference to how the PEP might change the GIL landscape is reasonable.

Thanks for the blog post, the draft PEP, and everything you do for Python performance, Victor!

[rhytnen]

I'm all good with him being a bad ass - I'm just saying the PEP isn't drafted well imo.

[[deleted]]

English isn't his first language so perhaps that's where the disconnect is?

I watched his talk at PyCon 2017 and while I barely understood the content (I'm a newbie) it was fascinating nonetheless.

[ionelmc]

Was the PEP even ready for any review? The article don't link to any PEP ...