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NumPy has a whole dispatch mechanism to deal with the tradeoffs. The main problem is code bloat: how many microarchitectures are you going to support with dispatch at runtime?

There is google’s highway, that provides an abstraction layer. It is used by NumPy.

PyPy dev here. Really cool project to convert RPython from python2 to rust. They have a long way to go, but seem to be making progress. Unfortunate name conflict with a typechrcker…

That cleanup can be explicit when needed by using context managers. Mixing resource handling with object lifetime is a bad design choice

The problem is the million small paper cuts. The stdlib changes are not all in pure python, many have implications for compiled modules like _ssl. The interpreter changes, especial…

CFFI is fast on PyPy. The JIT still cannot peer into the compiled C/C++ code, but it can generate efficient interface code since there is a dedicated _cffi_backend module built int…

Benchmarks are tricky. Do you have a specific use case you want sped up?

- The pure python repl started off in PyPy, although a lot of work was done to make it ready for prime time by the COython core devs - The lessons from HPy are slowly making their …

Yes. The C API those libraries use is a good fit to CPython, a bad fit to PyPy. Hence CFFI and HPy. Actually, many if the lessons from HPy are making their way into CPython since t…

Third party libraries like SciPy scikit-learn, pandas, tensorflow and pytorch have been critical to python’s success. Since CPython is written in C and exposes a nice C API, those …

PyPy core dev here. If anyone is interested in helping out, either financially or with coding, we can be reached various ways. See https://pypy.org/contact.html

> Imagine how Open Source Software could improve if a consortium of nations put their money and resources into commissioning bug fixes and enhancements, which would be of collectiv…

There is some information transfer happening. Antonio Cuni was at the latest Coython developer sprint and shared some insights from PyPy https://antocuni.eu/2025/09/24/tracing-jits…

PyPy v7.3.18: release of python 2.7, 3.10 and 3.11 beta

There are portable downloads of PyPy here https://pypy.org/download.html

That’s my post. Happy to answer any questions

Anyone can attend.

I think part of the point is that it doesn’t matter. You can’t preach “frugality” and @we all need to pitch in” and then use private jets and rock concerts for the few at the top. …

We try to keep around useful versions of Python3, based on what wheels packagers make available. NumPy<2 provides PyPy3.9 wheels, and we have PyPy3.10 ready. Now that NumPy has mov…

PyPy dev here. A little money could go along way to speeding up the PyPy base interpreter. Right now PyPy has no active income.

The article is more about how to pin to prevent breakage, but also includes a link to the migration guide. A draft of the complete changeset is https://numpy.org/devdocs/release/2.…

That sounds like cffi https://cffi.readthedocs.io/en/latest/

To make it clear: this is only a proposal, not a regulation. It has a very low chance of making it into the books as it goes against the legal framework for free speech. This minis…