How to convert PyDict to serde_json::Value?

[0x3E6]

I'm trying to convert Python dict to Rust serde_json::Value, but it seems that PyDict.tostring has turned all JSON keys into single quotes, so serde_json cannot parse it. How to fix it?

        let x = Python::with_gil(|py| {
            let locals = PyDict::new_bound(py);
            Python::run_bound(py, r#"
a= {"a":1, "b":2}
"#, None, Some(&locals)).unwrap();
            let ret = locals.get_item("a").unwrap().unwrap();
            println!("a value: {}", ret.to_string());
            if ret.is_instance_of::<PyDict>() {
                let s = ret.downcast::<PyDict>().unwrap().to_string();
                DataValue::Json(serde_json::from_str(s.as_str()).unwrap())
            } else {
                DataValue::String(ret.to_string())
            }
        }
        );
        println!("result: {:?}", x);

Output:

a value: {'a': 1, 'b': 2}

called `Result::unwrap()` on an `Err` value: Error("key must be a string", line: 1, column: 2)
thread 'tests::ret_json_test' panicked at test\examples\call_python_test.rs:279:66:
called `Result::unwrap()` on an `Err` value: Error("key must be a string", line: 1, column: 2)
stack backtrace:

[LilyFoote]

You could try this:

        let x = Python::with_gil(|py| {
            let locals = PyDict::new_bound(py);
            Python::run_bound(py, r#"
import json
a= json.dumps({"a":1, "b":2})
"#, None, Some(&locals)).unwrap();
            let ret = locals.get_item("a").unwrap().unwrap();
            let s = ret.extract::<String>().unwrap();
            DataValue::Json(serde_json::from_str(s.as_str()).unwrap())
        }
        );
        println!("result: {:?}", x);

I haven't tested this myself, so you may need to tweak it a bit.

You could also look into the pythonize crate, which might work for you.

[0x3E6]

Thanks, pythonize is work for me.
I have tried the json.dumps method, but I want to distinguish between str and dict.