pyo3/extensions/hello.rs

#![crate_type = "dylib"]

#[macro_use] extern crate cpython;

use cpython::{PyObject, PyResult, Python, PyTuple, PyDict};

py_module_initializer!(hello, inithello, PyInit_hello, |py, m| {
    try!(m.add(py, "__doc__", "Module documentation string"));
    try!(m.add(py, "run", py_fn!(py, run(*args, **kwargs))));
    try!(m.add(py, "val", py_fn!(py, val())));
    Ok(())
});

fn run(py: Python, args: &PyTuple, kwargs: &PyDict) -> PyResult<PyObject> {
    println!("Rust says: Hello Python!");
    for arg in args.iter(py) {
        println!("Rust got {}", arg);
    }
    for (key, val) in kwargs.items(py) {
        println!("{} = {}", key, val);
    }
    Ok(py.None())
}

fn val(_: Python) -> PyResult<i32> {
    Ok(42)
}