pyo3 0.19.1

Bindings to Python interpreter
Documentation 
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use criterion::{black_box, criterion_group, criterion_main, Bencher, Criterion};

use pyo3::prelude::*;
use pyo3::types::PyDict;
use rust_decimal::Decimal;

fn decimal_via_extract(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        let locals = PyDict::new(py);
        py.run(
            r#"
import decimal
py_dec = decimal.Decimal("0.0")
"#,
            None,
            Some(locals),
        )
        .unwrap();
        let py_dec = locals.get_item("py_dec").unwrap();

        b.iter(|| {
            let _: Decimal = black_box(py_dec).extract().unwrap();
        });
    })
}

fn criterion_benchmark(c: &mut Criterion) {
    c.bench_function("decimal_via_extract", decimal_via_extract);
}

criterion_group!(benches, criterion_benchmark);
criterion_main!(benches);