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pyo3 0.19.1

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

use pyo3::prelude::*;
use pyo3::types::{PyList, PySequence, PyTuple};

fn iter_tuple(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        const LEN: usize = 100_000;
        let tuple = PyTuple::new(py, 0..LEN);
        let mut sum = 0;
        b.iter(|| {
            for x in tuple.iter() {
                let i: u64 = x.extract().unwrap();
                sum += i;
            }
        });
    });
}

fn tuple_new(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        const LEN: usize = 50_000;
        b.iter(|| PyTuple::new(py, 0..LEN));
    });
}

fn tuple_get_item(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        const LEN: usize = 50_000;
        let tuple = PyTuple::new(py, 0..LEN);
        let mut sum = 0;
        b.iter(|| {
            for i in 0..LEN {
                sum += tuple.get_item(i).unwrap().extract::<usize>().unwrap();
            }
        });
    });
}

#[cfg(not(any(Py_LIMITED_API, PyPy)))]
fn tuple_get_item_unchecked(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        const LEN: usize = 50_000;
        let tuple = PyTuple::new(py, 0..LEN);
        let mut sum = 0;
        b.iter(|| {
            for i in 0..LEN {
                unsafe {
                    sum += tuple.get_item_unchecked(i).extract::<usize>().unwrap();
                }
            }
        });
    });
}

fn sequence_from_tuple(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        const LEN: usize = 50_000;
        let tuple = PyTuple::new(py, 0..LEN).to_object(py);
        b.iter(|| tuple.extract::<&PySequence>(py).unwrap());
    });
}

fn tuple_new_list(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        const LEN: usize = 50_000;
        let tuple = PyTuple::new(py, 0..LEN);
        b.iter(|| {
            let _pool = unsafe { py.new_pool() };
            let _ = PyList::new(py, tuple);
        });
    });
}

fn tuple_to_list(b: &mut Bencher<'_>) {
    Python::with_gil(|py| {
        const LEN: usize = 50_000;
        let tuple = PyTuple::new(py, 0..LEN);
        b.iter(|| {
            let _pool = unsafe { py.new_pool() };
            let _ = tuple.to_list();
        });
    });
}

fn criterion_benchmark(c: &mut Criterion) {
    c.bench_function("iter_tuple", iter_tuple);
    c.bench_function("tuple_new", tuple_new);
    c.bench_function("tuple_get_item", tuple_get_item);
    #[cfg(not(any(Py_LIMITED_API, PyPy)))]
    c.bench_function("tuple_get_item_unchecked", tuple_get_item_unchecked);
    c.bench_function("sequence_from_tuple", sequence_from_tuple);
    c.bench_function("tuple_new_list", tuple_new_list);
    c.bench_function("tuple_to_list", tuple_to_list);
}

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