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pyo3 0.18.3

Bindings to Python interpreter
Documentation 
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#![cfg(feature = "macros")]

use pyo3::prelude::*;
use pyo3::py_run;

#[pyclass(dict, unsendable)]
struct UnsendableDictClass {}

#[pymethods]
impl UnsendableDictClass {
    #[new]
    fn new() -> Self {
        UnsendableDictClass {}
    }
}

#[test]
#[cfg_attr(all(Py_LIMITED_API, not(Py_3_10)), ignore)]
fn test_unsendable_dict() {
    Python::with_gil(|py| {
        let inst = Py::new(py, UnsendableDictClass {}).unwrap();
        py_run!(py, inst, "assert inst.__dict__ == {}");
    });
}

#[pyclass(dict, unsendable, weakref)]
struct UnsendableDictClassWithWeakRef {}

#[pymethods]
impl UnsendableDictClassWithWeakRef {
    #[new]
    fn new() -> Self {
        Self {}
    }
}

#[test]
#[cfg_attr(all(Py_LIMITED_API, not(Py_3_10)), ignore)]
fn test_unsendable_dict_with_weakref() {
    Python::with_gil(|py| {
        let inst = Py::new(py, UnsendableDictClassWithWeakRef {}).unwrap();
        py_run!(py, inst, "assert inst.__dict__ == {}");
        py_run!(
            py,
            inst,
            "import weakref; assert weakref.ref(inst)() is inst; inst.a = 1; assert inst.a == 1"
        );
    });
}