Creating a Rust object that can be accessed as a dict in Python

[thomasbbrunner]

I have an object in Rust that I'd like to use as a dict in Python.

I have read the docs regarding this (https://pyo3.rs/main/class/protocols.html#mapping--sequence-types), but I'm not able to get something working.

For instance:

#[pyclass(get_all)]
pub struct MyClass {
    pub foo: u32,
    pub bar: u32,
}

#[pymethods]
impl MyClass {
    #[new]
    #[pyo3(signature = (
        *,
        foo = 0,
        bar = 0,
    ))]
    fn new(foo: u32, bar: u32) -> Self {
        Self {
            foo,
            bar,
        }
    }
}

And I'd like to be able to create a dict out of it in Python as:

>>> my_class = MyClass()
>>> d = dict(my_class)
>>> d["foo"]
0

Or (alternatively) I'd like to be able to get a list of attributes of this class:

>>> my_class = MyClass()
>>> my_class.slots()  # Or some other function.
("foo", "bar")

Is there a way to get PyO3 to do this for me, or do I have to manually implement this functionality?

[davidhewitt]

This functionality is not built in to pyo3.

To pass an object to dict() constructor, you'll have to implement __iter__ like for a Python type.