This is a serializer for Rust's serde ecosystem, which can convert Rust objects to Python values and back.

At the moment the Python structures it produces should be very similar to those which are produced by serde_json; i.e. calling Python's json.loads() on a value encoded by serde_json should produce an identical structure to that which is produced directly by pythonize.

This crate converts Rust types which implement the Serde serialization traits into Python objects using the PyO3 library.

Pythonize has two main public APIs: pythonize and depythonize.

use serde::{Serialize, Deserialize};
use pyo3::prelude::*;
use pythonize::{depythonize, pythonize};

#[derive(Debug, Serialize, Deserialize, PartialEq)]
struct Sample {
    foo: String,
    bar: Option<usize>
}

let sample = Sample {
    foo: "Foo".to_string(),
    bar: None
};

Python::attach(|py| {
    // Rust -> Python
    let obj =  pythonize(py, &sample).unwrap();

    assert_eq!("{'foo': 'Foo', 'bar': None}", &format!("{}", obj.repr().unwrap()));

    // Python -> Rust
    let new_sample: Sample = depythonize(&obj).unwrap();

    assert_eq!(new_sample, sample);
})

Enable support for serde_json's arbitrary_precision feature, which allows handling numbers that exceed the range of i128/u128 when converting serde_json::Value to and from Python.

[dependencies]
pythonize = { version = "0.29", features = ["arbitrary_precision"] }