usepyo3::prelude::*;/// Formats the sum of two numbers as string.
#[pyfunction]fnsum_as_string(a:usize, b:usize)->PyResult<String>{Ok((a + b).to_string())}/// A Python module implemented in Rust.
#[pymodule]fnpigs(_py: Python, m:&PyModule)->PyResult<()>{
m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;Ok(())}