$ pyo3-build-config_

Crate

Name: pyo3-build-config New version: 0.27.0 Release date: 2025-10-19T11:17:23Z

Crate readme

Short description Rust bindings for Python, including tools for creating native Python extension modules.

Long description PyO3 allows for writing native Python modules in Rust and embedding Python in Rust binaries. It supports CPython 3.7 and above, PyPy 7.3 and GraalPy 24.2 and above, requiring Rust 1.74 or greater. The library enables integration between Rust and Python code, making it usable from both languages.

Features • Supported Python distributions: CPython 3.7+, PyPy 7.3+, GraalPy 24.2+ • Requires Rust 1.74 or greater • Utilizes maturin for building and publishing Rust-based Python packages • Asynchronous support through pyo3-async-runtimes • Safety guarantees by leveraging Rust's features

Code Examples Add to Cargo.toml

 [dependencies]
pyo3 = { version = "0.27.0", features = ["extension-module"] }

Basic usage

 use pyo3::prelude::*;
use pyo3::types::IntoPyDict;

fn main() -> PyResult<()> {
    Python::attach(|py| {
        let sys = py.import("sys")?;
        let version: String = sys.getattr("version")?.extract()?;

        let locals = [("os", py.import("os")?)].into_py_dict(py)?;
        let user: String = py.eval("os.getenv('USER') or os.getenv('USERNAME') or 'Unknown'", None, Some(&locals))?.extract()?;

        println!("Hello {}, I'm Python {}", user, version);
        Ok(())
    })
}

Using maturin to generate a package

 $ mkdir string_sum
$ cd string_sum
$ python -m venv .env
$ source .env/bin/activate
$ pip install maturin
$ maturin init --bindings pyo3
$ maturin develop

Embedding Python in Rust

 sudo apt install python3-dev

Links • https://github.com/PyO3/pyo3 • https://pyo3.rs • https://docs.rs/pyo3/ • https://pyo3.rs/v0.27.0/migration.html

https://api.github.com/repos/PyO3/pyo3/releases/255595618

Release info

Release version: 0.27.0

Release description This release marks the first PyO3 version tested against Python 3.14.0 final, with no major changes to support since version 0.26. Notably, support for PyPy 3.9 and PyPy 3.10 has been removed as they are no longer supported upstream. The FromPyObject trait has been reworked to align with the IntoPyObject trait from PyO3 0.23, resulting in a more efficient and flexible implementation. The .downcast() functions have been deprecated in favor of the .cast() functions, improving usability and error messaging. Additionally, changes to PyCapsule operations address lifetime issues with .name() and .reference(), along with encouraging the validation of capsule names. Incremental improvements, bug fixes, and smaller features have also been implemented. Further details can be found in the migration guide.

Code Examples