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Re:Tracing JITs in the Real World CPython Core Dev Sprint by antocuni on Friday September 26, 2025 @10:48AM (#45387150)
pypy IS compatible with C extensions, via what we call "cpyext": https://doc.pypy.org/en/latest/faq.html#do-c-extension-modul...

The problem of cpyext is that it's super slow, for good reasons: https://pypy.org/posts/2018/09/inside-cpyext-why-emulating-c...

There are efforts to create a new C API which is more friendly to alternative implementations (including CPython itself, when they want to change how they do things internally): https://hpyproject.org/ https://github.com/py-ni

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