How do i turn a PyNone into a Bound<PyAny>?

[alexanderankin]

Im trying to unwrap my locals, and while i could theoretically just call unwrap since its test code, i would like to know how to do this kind of thing in case i need to for shipped code. im not very new to rust, but have no idea what im doing:

error[E0277]: the trait bound `pyo3::Borrowed<'_, '_, PyNone>: PyClass` is not satisfied
   --> tests/test.rs:228:96
    |
228 |             let abc = locals.get_item(r"abc").unwrap_or(Option::None).unwrap_or(Bound::new(py, PyNone::get_bound(py)));
    |                                                                                 ----------     ^^^^^^^^^^^^^^^^^^^^^ the trait `PyClass` is not implemented for `pyo3::Borrowed<'_, '_, PyNone>`
    |                                                                                 |
    |                                                                                 required by a bound introduced by this call
    |

full disclosure is im working on pydantic core tests, here are some more details on what im doing and seeing:

    #[test]
    fn test() {
        Python::with_gil(|py| {
            let locals = PyDict::new_bound(py);
            // py.import_bound(r"pydantic_core").unwrap();
            // py.run_bound(r"
            //     from pydantic import BaseModel
            //     abc = BaseModel
            // ", None, Some(&locals)).unwrap();
            let abc = locals.get_item(r"abc").unwrap_or(Option::None).unwrap_or(PyNone::get_bound(py));
            println!("{:#?}", abc);
        })
    }

error[E0308]: mismatched types
   --> tests/test.rs:228:81
    |
228 |             let abc = locals.get_item(r"abc").unwrap_or(Option::None).unwrap_or(PyNone::get_bound(py));
    |                                                                       --------- ^^^^^^^^^^^^^^^^^^^^^ expected `Bound<'_, PyAny>`, found `Borrowed<'_, '_, PyNone>`
    |                                                                       |
    |                                                                       arguments to this method are incorrect
    |
    = note: expected struct `pyo3::Bound<'_, pyo3::PyAny>`
               found struct `pyo3::Borrowed<'_, '_, PyNone>`
help: the return type of this call is `pyo3::Borrowed<'_, '_, PyNone>` due to the type of the argument passed
   --> tests/test.rs:228:23
    |
228 |             let abc = locals.get_item(r"abc").unwrap_or(Option::None).unwrap_or(PyNone::get_bound(py));
    |                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---------------------^
    |                                                                                 |
    |                                                                                 this argument influences the return type of `unwrap_or`
note: method defined here
   --> /Users/toor/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/option.rs:951:12
    |
951 |     pub fn unwrap_or(self, default: T) -> T {
    |            ^^^^^^^^^

let abc = locals.get_item(r"abc").unwrap_or(Option::None).unwrap_or(Bound::new(py, PyNone::get_bound(py)));

error[E0277]: the trait bound `pyo3::Borrowed<'_, '_, PyNone>: PyClass` is not satisfied
   --> tests/test.rs:228:96
    |
228 |             let abc = locals.get_item(r"abc").unwrap_or(Option::None).unwrap_or(Bound::new(py, PyNone::get_bound(py)));
    |                                                                                 ----------     ^^^^^^^^^^^^^^^^^^^^^ the trait `PyClass` is not implemented for `pyo3::Borrowed<'_, '_, PyNone>`
    |                                                                                 |
    |                                                                                 required by a bound introduced by this call
    |
    = help: the following other types implement trait `PyClass`:
              ArgsKwargs
              PydanticUndefinedType
              SchemaError
              ValidationError
              _pydantic_core::errors::validation_exception::PyLineError
              PydanticOmit
              PydanticUseDefault
              PydanticCustomError
            and 11 others
    = note: required for `PyClassInitializer<pyo3::Borrowed<'_, '_, PyNone>>` to implement `From<pyo3::Borrowed<'_, '_, PyNone>>`
    = note: required for `pyo3::Borrowed<'_, '_, PyNone>` to implement `Into<PyClassInitializer<pyo3::Borrowed<'_, '_, PyNone>>>`
note: required by a bound in `pyo3::Bound::<'py, T>::new`
   --> /Users/toor/.cargo/registry/src/index.crates.io-6f17d22bba15001f/pyo3-0.21.0-beta.0/src/instance.rs:93:21
    |
91  |     pub fn new(
    |            --- required by a bound in this associated function
92  |         py: Python<'py>,
93  |         value: impl Into<PyClassInitializer<T>>,
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `Bound::<'py, T>::new`

[adamreichold]

I think Borrowed::to_owned followed by Bound::into_any should do the trick, i.e.

PyNone::get_bound(py).to_owned().into_any()

[alexanderankin]

Thanks guys I will test it out asap

[LilyFoote]

You could do:

py.None().into_bound(py)

[alexanderankin]

Thanks guys I will test it out asap