flapigen-rs VS rust-cpython

Look into flapigen or one of the other solutions at Rust Interop or Are We Extending Yet? for that sort of thing.

use flapigen to define how our Rust structs will go across the FFI.

Yes, it's possible to generate Java and C++ bindings for Rust library using https://github.com/Dushistov/flapigen-rs .

Is there anything like flapigen-rs, but for Go?

I've never used pyo3, just cpython, but the latter at least let me do things like:

And don't forget https://github.com/dgrunwald/rust-cpython to complete the circle

For interoperating with Python, check out PyO3 or rust-cpython. (More generally, see Rust Interop and Are We Extending Yet?)

You probably should learn Rust. Aside from the process of learning new and different languages making you a better programmer, rust-cpython, PyO3, or Interoptopus make it easy to expose Python APIs from your Rust code. (eg. So it's easy to compile the same codebase as both a Python module and a WebAssembly module.)

Have you looked into abi_stable, flapigen, interoptopus, cbindgen, PyO3, or rust-cpython?

Personally, I'm not willing to compromise on my GUI look and feel, so I use PyQt or PySide to write my GUIs against the QWidget API (I'm a KDE user and Python is the only language with mature memory-safe bindings to Qt) and, if the project can be structured with a frontend-backend separation, I use rust-cpython or PyO3 to write a backend in Rust that the Python frontend can import. Sort of using Python/Rust as a QWidget analogue to the QML/C++ architecture promoted for Qt Quick. (Which I don't use because it's still too incomplete on Kubuntu 20.04 LTS.)

also, check out rust-cpython, PyO3, and maturin, among other things. They're really nice options for using Rust for its strengths and Python for its strengths within the same project.

This section uses flapigen to expand the foreign_class macro into many cpython functions as an extension module, and cargo compiles it as a cdylib. If you want to see what that looks like, install cargo-expand and run cargo expand. You'll get a lot of generated rust code.

For Python specifically, In addition to using rust-cpython or PyO3, maturin makes it really comfortable to build, package, and publish Rust code into Python packages and, if your niche doesn't quite fit, there's setuptools-python which might do it.

hlua or rlua are what you want for Lua, rust-cpython or PyO3 for Python, rutie for Ruby, and possibly deno_core for JavaScript.