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Yup...i can confirm that
(lemmy.world)
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this post was submitted on 16 Sep 2024
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Extension modules are implemented in C because the interpreter is written in C. If it were written in another language, folks would write extension modules for that language instead. Also, it would be less relevant if people used portable C bindings like cffi, which are portable to PyPy and other interpreters… but they don't.
Extension modules can be, and are, written in Rust and C++. And PyPy has a compatibility layer to run extensions (such as numpy) that are written for CPython.
The reason extension modules are typically in C is of course the API is in C, but that's true of
cffias well (though you're right thatcffiis more portable). And the reason the API is in C is more fundamental than "CPython is written in C".