pyo3 0.12.1

Bindings to Python interpreter
Documentation 
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use pyo3::prelude::*;
use pyo3::types::{PyDict, PyTuple};

mod common;

#[pyclass]
struct MyClass {}

#[pymethods]
impl MyClass {
    #[staticmethod]
    #[args(args = "*")]
    fn test_args(args: &PyTuple) -> PyResult<&PyTuple> {
        Ok(args)
    }

    #[staticmethod]
    #[args(kwargs = "**")]
    fn test_kwargs(kwargs: Option<&PyDict>) -> PyResult<Option<&PyDict>> {
        Ok(kwargs)
    }
}

#[test]
fn variable_args() {
    let gil = Python::acquire_gil();
    let py = gil.python();
    let my_obj = py.get_type::<MyClass>();
    py_assert!(py, my_obj, "my_obj.test_args() == ()");
    py_assert!(py, my_obj, "my_obj.test_args(1) == (1,)");
    py_assert!(py, my_obj, "my_obj.test_args(1, 2) == (1, 2)");
}

#[test]
fn variable_kwargs() {
    let gil = Python::acquire_gil();
    let py = gil.python();
    let my_obj = py.get_type::<MyClass>();
    py_assert!(py, my_obj, "my_obj.test_kwargs() == None");
    py_assert!(py, my_obj, "my_obj.test_kwargs(test=1) == {'test': 1}");
    py_assert!(
        py,
        my_obj,
        "my_obj.test_kwargs(test1=1, test2=2) == {'test1':1, 'test2':2}"
    );
}