Why not .py to .rs

Summary

Hi RustPython team — thanks for your great work.

I have a question/idea: RustPython runs Python on a Rust-based interpreter. Have you ever considered supporting the reverse workflow — transpiling Python into Rust code, then compiling it with rustc?

Proposed workflow:

Input: Python source code

Step 1: Parse Python → build AST (RustPython already has a parser/AST)

Step 2: Convert Python AST → Rust AST / Rust source code

Step 3: Compile generated Rust with rustc to produce a native binary

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The problem of trans-piling Python code into Rust is likely beyond the scope of this project.

Well, still posible. It is similar to a mypyc approach.
Rather than generating rust AST, we can pre-compile the python code to native using rustpython-jit at the moment.
Then it will be more approachable, and be able to fallback to python code when it is not compilable well.

@youknowone

I found this project: https://github.com/paiml/depyler. It mentions RustPython.
i appreciate all developers and this effort @youknowone

Couldn't you use cython to generate a C file and then use a combination of pyo3 and c2rust to convert it? At that point it's simpler to just compile the C file though, as you gain no safety or anything from using the rust version.

@arihant2math

I checked Cython code and realized it is not true C, and it does not generate pure C code.
If Cython could generate pure C code, that would be good. Then I could convert .py to .c, compile it fully natively, achieve true C-level speed, and then connect it back to Python. @arihant2math

I really don't want to start this kind of discussion here, so it is not a real question.

What is true C code? If you have a code import logging; logging.info('hello'), you can turn it into C ast and compile it, but where the logging library come from? That's python library. And thats what Cython and mypyc do. You'd better check out what crystal lang achieved and limited.

And the goal of RustPython is neither transpiler nor crystal. It is obvious.

What about Nuitka?¹

Currently, Nuitka does not work on Arch Linux due to an incompatibility with Python 3.14. ↩

I'd suggest looking into why python cannot be compiled into C/Rust code. Python has fundamental differences that require it to have a runtime interpreter, meaning it can never actually become C code.

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Why not .py to .rs #6458

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Why not .py to .rs #6458

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coderabbitai commented on Dec 19, 2025

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fanninpm commented on Dec 19, 2025

youknowone commented on Dec 20, 2025

MominIqbal-1234 commented on Dec 20, 2025

arihant2math commented on Jan 5, 2026

MominIqbal-1234 commented on Jan 6, 2026

youknowone commented on Jan 6, 2026

fanninpm commented on Jan 12, 2026

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arihant2math commented on Jan 12, 2026

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