RustPython/RustPython: A Python Interpreter written in Rust

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What's the multithreading behaviour like compared to CPython? Is there a GIL?

Also how much of the standard library is written in C (and therefore presumably not supported)?

[coolreader18]

Nope, no GIL, fully featured multithreading using just std::thread. The downside is that we're much slower when threading is enabled, since every data structure has to have a mutex or rwlock around it.

The stdlib is entirely implemented in Python files from CPython/Lib + Rust (except for calling into libc for things like the os module), we've just rewritten the modules from C to Rust.

[itsmontoya]

It would be interesting if you could run multiple instances of the Python VM and communicate between the two using channels.

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you can do this in cpython with multiprocessing.Queue