pyo3/tests/test_class_new.rs

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#![cfg(feature = "macros")]
use pyo3::exceptions::PyValueError;
use pyo3::prelude::*;
#[pyclass]
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struct EmptyClassWithNew {}
#[pymethods]
impl EmptyClassWithNew {
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#[new]
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fn new() -> EmptyClassWithNew {
EmptyClassWithNew {}
}
}
#[test]
fn empty_class_with_new() {
let gil = Python::acquire_gil();
let py = gil.python();
let typeobj = py.get_type::<EmptyClassWithNew>();
assert!(typeobj
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.call((), None)
.unwrap()
.cast_as::<PyCell<EmptyClassWithNew>>()
.is_ok());
}
#[pyclass]
struct UnitClassWithNew;
#[pymethods]
impl UnitClassWithNew {
#[new]
fn new() -> Self {
Self
}
}
#[test]
fn unit_class_with_new() {
Python::with_gil(|py| {
let typeobj = py.get_type::<UnitClassWithNew>();
assert!(typeobj
.call((), None)
.unwrap()
.cast_as::<PyCell<UnitClassWithNew>>()
.is_ok());
});
}
#[pyclass]
struct TupleClassWithNew(i32);
#[pymethods]
impl TupleClassWithNew {
#[new]
fn new(arg: i32) -> Self {
Self(arg)
}
}
#[test]
fn tuple_class_with_new() {
Python::with_gil(|py| {
let typeobj = py.get_type::<TupleClassWithNew>();
let wrp = typeobj.call((42,), None).unwrap();
let obj = wrp.cast_as::<PyCell<TupleClassWithNew>>().unwrap();
let obj_ref = obj.borrow();
assert_eq!(obj_ref.0, 42);
});
}
#[pyclass]
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#[derive(Debug)]
struct NewWithOneArg {
_data: i32,
}
#[pymethods]
impl NewWithOneArg {
#[new]
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fn new(arg: i32) -> NewWithOneArg {
NewWithOneArg { _data: arg }
}
}
#[test]
fn new_with_one_arg() {
let gil = Python::acquire_gil();
let py = gil.python();
let typeobj = py.get_type::<NewWithOneArg>();
let wrp = typeobj.call((42,), None).unwrap();
let obj = wrp.cast_as::<PyCell<NewWithOneArg>>().unwrap();
let obj_ref = obj.borrow();
assert_eq!(obj_ref._data, 42);
}
#[pyclass]
struct NewWithTwoArgs {
_data1: i32,
_data2: i32,
}
#[pymethods]
impl NewWithTwoArgs {
#[new]
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fn new(arg1: i32, arg2: i32) -> Self {
NewWithTwoArgs {
_data1: arg1,
_data2: arg2,
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}
}
}
#[test]
fn new_with_two_args() {
let gil = Python::acquire_gil();
let py = gil.python();
let typeobj = py.get_type::<NewWithTwoArgs>();
let wrp = typeobj
.call((10, 20), None)
.map_err(|e| e.print(py))
.unwrap();
let obj = wrp.cast_as::<PyCell<NewWithTwoArgs>>().unwrap();
let obj_ref = obj.borrow();
assert_eq!(obj_ref._data1, 10);
assert_eq!(obj_ref._data2, 20);
}
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#[pyclass(subclass)]
struct SuperClass {
#[pyo3(get)]
from_rust: bool,
}
#[pymethods]
impl SuperClass {
#[new]
fn new() -> Self {
SuperClass { from_rust: true }
}
}
/// Checks that `subclass.__new__` works correctly.
/// See https://github.com/PyO3/pyo3/issues/947 for the corresponding bug.
#[test]
fn subclass_new() {
let gil = Python::acquire_gil();
let py = gil.python();
let super_cls = py.get_type::<SuperClass>();
let source = pyo3::indoc::indoc!(
r#"
class Class(SuperClass):
def __new__(cls):
return super().__new__(cls) # This should return an instance of Class
@property
def from_rust(self):
return False
c = Class()
assert c.from_rust is False
"#
);
let globals = PyModule::import(py, "__main__").unwrap().dict();
globals.set_item("SuperClass", super_cls).unwrap();
py.run(source, Some(globals), None)
.map_err(|e| e.print(py))
.unwrap();
}
#[pyclass]
#[derive(Debug)]
struct NewWithCustomError {}
struct CustomError;
impl From<CustomError> for PyErr {
fn from(_error: CustomError) -> PyErr {
PyValueError::new_err("custom error")
}
}
#[pymethods]
impl NewWithCustomError {
#[new]
fn new() -> Result<NewWithCustomError, CustomError> {
Err(CustomError)
}
}
#[test]
fn new_with_custom_error() {
let gil = Python::acquire_gil();
let py = gil.python();
let typeobj = py.get_type::<NewWithCustomError>();
let err = typeobj.call0().unwrap_err();
assert_eq!(err.to_string(), "ValueError: custom error");
}