Method extract

src/objects/none.rs:51–61

(py: Python, obj: &PyObject)

impl FromPyObject<'_> for PyNone {
    fn extract(py: Python, obj: &PyObject) -> PyResult<Self> {
        if *obj == py.None() {
            Ok(PyNone)
        } else {
            let msg = format!("Expected None but received {}", obj.get_type(py).name(py));
            Err(PyErr::new_lazy_init(
                py.get_type::<exc::TypeError>(),
                Some(msg.to_py_object(py).into_object()),
            ))
        }
    }
}