What I also found is that Racket is a very good match to Rust, in a similar style as writing Python and extending it with translated C code where speed is neede

What I also found is that Racket is a very good match to Rust, in a similar style as writing Python and extending it with translated C code where speed is needed. The advantage is that both languages allow for a functional style and Racket is much faster than Python. Racket is, almost like Clojure, highly interactive (though not completely so, it has a conceptual separation of compile time and run time), and on top of that, it can call easily into a C ABI, which Rust provides. Both languages (Rust and Racket) are well-suited for writing pure functions returning immutable results which allows for a nice match in style. Calling across the language boundary is a bit slower than in the Python/C case but it can achieve a decent speed-up. Racket's places allow for parallel execution with almost separate memory images, and it also has green threads. And Racket has batteries such as a GUI toolkit and image data types included which is really nice.