use pyo3::prelude::*; /// Formats the sum of two numbers as string. #[pyfunction] fn sum_as_string(a: usize, b: usize) -> PyResult { Ok((a + b).to_string()) } /// A Python module implemented in Rust. #[pymodule] fn libpt_py(_py: Python, m: &PyModule) -> PyResult<()> { m.add_function(wrap_pyfunction!(sum_as_string, m)?)?; Ok(()) }