pyo3/tests/test_class_attributes.rs

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#![cfg(feature = "macros")]
use pyo3::{exceptions::PyValueError, prelude::*};
mod common;
#[pyclass]
struct Foo {
#[pyo3(get)]
x: i32,
}
#[pyclass]
struct Bar {
#[pyo3(get)]
x: i32,
}
#[pymethods]
impl Foo {
#[classattr]
const MY_CONST: &'static str = "foobar";
#[classattr]
#[pyo3(name = "RENAMED_CONST")]
const MY_CONST_2: &'static str = "foobar_2";
#[classattr]
fn a() -> i32 {
5
}
#[classattr]
#[pyo3(name = "B")]
fn b() -> String {
"bar".to_string()
}
#[classattr]
fn bar() -> Bar {
Bar { x: 2 }
}
#[classattr]
fn a_foo() -> Foo {
Foo { x: 1 }
}
#[classattr]
fn a_foo_with_py(py: Python<'_>) -> Py<Foo> {
Py::new(py, Foo { x: 1 }).unwrap()
}
}
#[test]
fn class_attributes() {
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Python::with_gil(|py| {
let foo_obj = py.get_type::<Foo>();
py_assert!(py, foo_obj, "foo_obj.MY_CONST == 'foobar'");
py_assert!(py, foo_obj, "foo_obj.RENAMED_CONST == 'foobar_2'");
py_assert!(py, foo_obj, "foo_obj.a == 5");
py_assert!(py, foo_obj, "foo_obj.B == 'bar'");
py_assert!(py, foo_obj, "foo_obj.a_foo.x == 1");
py_assert!(py, foo_obj, "foo_obj.a_foo_with_py.x == 1");
});
}
// Ignored because heap types are not immutable:
// https://github.com/python/cpython/blob/master/Objects/typeobject.c#L3399-L3409
#[test]
#[ignore]
fn class_attributes_are_immutable() {
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Python::with_gil(|py| {
let foo_obj = py.get_type::<Foo>();
py_expect_exception!(py, foo_obj, "foo_obj.a = 6", PyTypeError);
});
}
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#[pymethods]
impl Bar {
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#[classattr]
fn a_foo() -> Foo {
Foo { x: 3 }
}
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}
#[test]
fn recursive_class_attributes() {
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Python::with_gil(|py| {
let foo_obj = py.get_type::<Foo>();
let bar_obj = py.get_type::<Bar>();
py_assert!(py, foo_obj, "foo_obj.a_foo.x == 1");
py_assert!(py, foo_obj, "foo_obj.bar.x == 2");
py_assert!(py, bar_obj, "bar_obj.a_foo.x == 3");
});
}
#[test]
#[should_panic(
expected = "An error occurred while initializing `BrokenClass.fails_to_init`: \
ValueError: failed to create class attribute"
)]
fn test_fallible_class_attribute() {
#[pyclass]
struct BrokenClass;
#[pymethods]
impl BrokenClass {
#[classattr]
fn fails_to_init() -> PyResult<i32> {
Err(PyValueError::new_err("failed to create class attribute"))
}
}
Python::with_gil(|py| {
py.get_type::<BrokenClass>();
})
}