223 lines
11 KiB
Markdown
223 lines
11 KiB
Markdown
# PyO3
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[](https://github.com/PyO3/pyo3/actions)
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[](https://pyo3.rs/dev/bench/)
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[](https://codecov.io/gh/PyO3/pyo3)
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[](https://crates.io/crates/pyo3)
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[](https://rust-lang.github.io/rfcs/2495-min-rust-version.html)
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[](https://gitter.im/PyO3/Lobby)
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[](https://github.com/PyO3/pyo3/blob/main/Contributing.md)
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[Rust](https://www.rust-lang.org/) bindings for [Python](https://www.python.org/), including tools for creating native Python extension modules. Running and interacting with Python code from a Rust binary is also supported.
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- User Guide: [stable](https://pyo3.rs) | [main](https://pyo3.rs/main)
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- API Documentation: [stable](https://docs.rs/pyo3/) | [main](https://pyo3.rs/main/doc)
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## Usage
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PyO3 supports the following software versions:
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- Python 3.7 and up (CPython and PyPy)
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- Rust 1.48 and up
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You can use PyO3 to write a native Python module in Rust, or to embed Python in a Rust binary. The following sections explain each of these in turn.
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### Using Rust from Python
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PyO3 can be used to generate a native Python module. The easiest way to try this out for the first time is to use [`maturin`](https://github.com/PyO3/maturin). `maturin` is a tool for building and publishing Rust-based Python packages with minimal configuration. The following steps install `maturin`, use it to generate and build a new Python package, and then launch Python to import and execute a function from the package.
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First, follow the commands below to create a new directory containing a new Python `virtualenv`, and install `maturin` into the virtualenv using Python's package manager, `pip`:
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```bash
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# (replace string_sum with the desired package name)
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$ mkdir string_sum
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$ cd string_sum
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$ python -m venv .env
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$ source .env/bin/activate
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$ pip install maturin
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```
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Still inside this `string_sum` directory, now run `maturin init`. This will generate the new package source. When given the choice of bindings to use, select pyo3 bindings:
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```bash
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$ maturin init
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✔ 🤷 What kind of bindings to use? · pyo3
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✨ Done! New project created string_sum
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```
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The most important files generated by this command are `Cargo.toml` and `lib.rs`, which will look roughly like the following:
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**`Cargo.toml`**
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```toml
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[package]
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name = "string_sum"
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version = "0.1.0"
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edition = "2018"
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[lib]
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name = "string_sum"
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# "cdylib" is necessary to produce a shared library for Python to import from.
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#
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# Downstream Rust code (including code in `bin/`, `examples/`, and `tests/`) will not be able
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# to `use string_sum;` unless the "rlib" or "lib" crate type is also included, e.g.:
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# crate-type = ["cdylib", "rlib"]
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crate-type = ["cdylib"]
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[dependencies]
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pyo3 = { version = "0.15.1", features = ["extension-module"] }
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```
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**`src/lib.rs`**
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```rust
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use pyo3::prelude::*;
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/// Formats the sum of two numbers as string.
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#[pyfunction]
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fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
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Ok((a + b).to_string())
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}
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/// A Python module implemented in Rust. The name of this function must match
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/// the `lib.name` setting in the `Cargo.toml`, else Python will not be able to
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/// import the module.
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#[pymodule]
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fn string_sum(_py: Python, m: &PyModule) -> PyResult<()> {
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m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
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Ok(())
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}
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```
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Finally, run `maturin develop`. This will build the package and install it into the Python virtualenv previously created and activated. The package is then ready to be used from `python`:
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```bash
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$ maturin develop
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# lots of progress output as maturin runs the compilation...
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$ python
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>>> import string_sum
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>>> string_sum.sum_as_string(5, 20)
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'25'
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```
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To make changes to the package, just edit the Rust source code and then re-run `maturin develop` to recompile.
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To run this all as a single copy-and-paste, use the bash script below (replace `string_sum` in the first command with the desired package name):
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```bash
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mkdir string_sum && cd "$_"
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python -m venv .env
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source .env/bin/activate
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pip install maturin
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maturin init --bindings pyo3
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maturin develop
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```
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As well as with `maturin`, it is possible to build using [`setuptools-rust`](https://github.com/PyO3/setuptools-rust) or [manually](https://pyo3.rs/latest/building_and_distribution.html#manual-builds). Both offer more flexibility than `maturin` but require more configuration to get started.
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### Using Python from Rust
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To embed Python into a Rust binary, you need to ensure that your Python installation contains a shared library. The following steps demonstrate how to ensure this (for Ubuntu), and then give some example code which runs an embedded Python interpreter.
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To install the Python shared library on Ubuntu:
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```bash
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sudo apt install python3-dev
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```
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Start a new project with `cargo new` and add `pyo3` to the `Cargo.toml` like this:
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```toml
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[dependencies.pyo3]
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version = "0.15.1"
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features = ["auto-initialize"]
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```
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Example program displaying the value of `sys.version` and the current user name:
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```rust
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use pyo3::prelude::*;
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use pyo3::types::IntoPyDict;
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fn main() -> PyResult<()> {
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Python::with_gil(|py| {
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let sys = py.import("sys")?;
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let version: String = sys.getattr("version")?.extract()?;
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let locals = [("os", py.import("os")?)].into_py_dict(py);
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let code = "os.getenv('USER') or os.getenv('USERNAME') or 'Unknown'";
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let user: String = py.eval(code, None, Some(&locals))?.extract()?;
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println!("Hello {}, I'm Python {}", user, version);
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Ok(())
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})
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}
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```
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The guide has [a section](https://pyo3.rs/latest/python_from_rust.html) with lots of examples
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about this topic.
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## Tools and libraries
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- [maturin](https://github.com/PyO3/maturin) _Zero configuration build tool for Rust-made Python extensions_.
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- [setuptools-rust](https://github.com/PyO3/setuptools-rust) _Setuptools plugin for Rust support_.
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- [pyo3-built](https://github.com/PyO3/pyo3-built) _Simple macro to expose metadata obtained with the [`built`](https://crates.io/crates/built) crate as a [`PyDict`](https://docs.rs/pyo3/*/pyo3/types/struct.PyDict.html)_
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- [rust-numpy](https://github.com/PyO3/rust-numpy) _Rust binding of NumPy C-API_
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- [dict-derive](https://github.com/gperinazzo/dict-derive) _Derive FromPyObject to automatically transform Python dicts into Rust structs_
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- [pyo3-log](https://github.com/vorner/pyo3-log) _Bridge from Rust to Python logging_
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- [pythonize](https://github.com/davidhewitt/pythonize) _Serde serializer for converting Rust objects to JSON-compatible Python objects_
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- [pyo3-asyncio](https://github.com/awestlake87/pyo3-asyncio) Utilities for working with Python's Asyncio library and async functions
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## Examples
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- [hyperjson](https://github.com/mre/hyperjson) _A hyper-fast Python module for reading/writing JSON data using Rust's serde-json_
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- [html-py-ever](https://github.com/PyO3/setuptools-rust/tree/main/examples/html-py-ever) _Using [html5ever](https://github.com/servo/html5ever) through [kuchiki](https://github.com/kuchiki-rs/kuchiki) to speed up html parsing and css-selecting._
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- [point-process](https://github.com/ManifoldFR/point-process-rust/tree/master/pylib) _High level API for pointprocesses as a Python library_
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- [autopy](https://github.com/autopilot-rs/autopy) _A simple, cross-platform GUI automation library for Python and Rust._
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- Contains an example of building wheels on TravisCI and appveyor using [cibuildwheel](https://github.com/pypa/cibuildwheel)
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- [orjson](https://github.com/ijl/orjson) _Fast Python JSON library_
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- [inline-python](https://github.com/fusion-engineering/inline-python) _Inline Python code directly in your Rust code_
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- [Rogue-Gym](https://github.com/kngwyu/rogue-gym) _Customizable rogue-like game for AI experiments_
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- Contains an example of building wheels on Azure Pipelines
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- [fastuuid](https://github.com/thedrow/fastuuid/) _Python bindings to Rust's UUID library_
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- [wasmer-python](https://github.com/wasmerio/wasmer-python) _Python library to run WebAssembly binaries_
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- [mocpy](https://github.com/cds-astro/mocpy) _Astronomical Python library offering data structures for describing any arbitrary coverage regions on the unit sphere_
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- [tokenizers](https://github.com/huggingface/tokenizers/tree/master/bindings/python) _Python bindings to the Hugging Face tokenizers (NLP) written in Rust_
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- [pyre](https://github.com/Project-Dream-Weaver/pyre-http) _Fast Python HTTP server written in Rust_
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- [jsonschema-rs](https://github.com/Stranger6667/jsonschema-rs/tree/master/bindings/python) _Fast JSON Schema validation library_
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- [css-inline](https://github.com/Stranger6667/css-inline/tree/master/bindings/python) _CSS inlining for Python implemented in Rust_
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- [cryptography](https://github.com/pyca/cryptography/tree/main/src/rust) _Python cryptography library with some functionality in Rust_
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- [polaroid](https://github.com/daggy1234/polaroid) _Hyper Fast and safe image manipulation library for Python written in Rust_
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- [ormsgpack](https://github.com/aviramha/ormsgpack) _Fast Python msgpack library_
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- [bed-reader](https://github.com/fastlmm/bed-reader) _Read and write the PLINK BED format, simply and efficiently_
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- Shows Rayon/ndarray::parallel (including capturing errors, controlling thread num), Python types to Rust generics, Github Actions
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## Articles and other media
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- [Nine Rules for Writing Python Extensions in Rust](https://towardsdatascience.com/nine-rules-for-writing-python-extensions-in-rust-d35ea3a4ec29?sk=f8d808d5f414154fdb811e4137011437) - Dec 31, 2021
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- [Calling Rust from Python using PyO3](https://saidvandeklundert.net/learn/2021-11-18-calling-rust-from-python-using-pyo3/) - Nov 18, 2021
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- [davidhewitt's 2021 talk at Rust Manchester meetup](https://www.youtube.com/watch?v=-XyWG_klSAw&t=320s) - Aug 19, 2021
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- [Incrementally porting a small Python project to Rust](https://blog.waleedkhan.name/port-python-to-rust/) - Apr 29, 2021
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- [Vortexa - Integrating Rust into Python](https://www.vortexa.com/insight/integrating-rust-into-python) - Apr 12, 2021
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- [Writing and publishing a Python module in Rust](https://blog.yossarian.net/2020/08/02/Writing-and-publishing-a-python-module-in-rust) - Aug 2, 2020
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## Contributing
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Everyone is welcomed to contribute to PyO3! There are many ways to support the project, such as:
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- help PyO3 users with issues on GitHub and Gitter
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- improve documentation
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- write features and bugfixes
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- publish blogs and examples of how to use PyO3
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Our [contributing notes](https://github.com/PyO3/pyo3/blob/main/Contributing.md) and [architecture guide](https://github.com/PyO3/pyo3/blob/main/Architecture.md) have more resources if you wish to volunteer time for PyO3 and are searching where to start.
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If you don't have time to contribute yourself but still wish to support the project's future success, some of our maintainers have GitHub sponsorship pages:
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- [davidhewitt](https://github.com/sponsors/davidhewitt)
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## License
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PyO3 is licensed under the [Apache-2.0 license](https://opensource.org/licenses/APACHE-2.0).
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Python is licensed under the [Python License](https://docs.python.org/3/license.html).
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