It's not possible to do with no translation penalty. Rust (and other languages like it) need the sizes of objects known at compile time in order to allocate spa

It's not possible to do with no translation penalty. Rust (and other languages like it) need the sizes of objects known at compile time in order to allocate space on the stack (and within struct fields). One way you could do it would be to add dynamically dispatched ".get_attribute(str) -> Option<...>" methods which adds a lot of overhead. Another way would be to have some bastardised `build.rs` script that constructs Rust structs from Python class definitions. This keeps the definitions in Python but obviously doesn't track dynamic changes to it at runtime.