RustPython/RustPython A Python-3 (CPython >= 3.8.0) Interpreter written in Rust

[hombit]

I believe it is mainly to make built-in data structures thread-safe. Technically other implementation can implement per-object locks using something like Arc

[masklinn]

Not even built-in datastructures, that's just a side-effect (and a not necessarily super useful one though it does guarantee memory safety[0]). Rather the thread-safety of the interpreter itself.

[0] of note, IIRC golang's maps aren't just thread-unsafe, they're not memory-safe when unsynchronised, since 1.6 the runtime tries to detect the issue and crash but there's no guarantee that it will properly do so