119 lines
3.6 KiB
Markdown
119 lines
3.6 KiB
Markdown
# PyO3 [](https://travis-ci.org/PyO3/pyo3) [](https://ci.appveyor.com/project/fafhrd91/pyo3) [](https://codecov.io/gh/PyO3/pyo3) [](https://crates.io/crates/pyo3) [](https://gitter.im/PyO3/Lobby)
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[Rust](http://www.rust-lang.org/) bindings for the [Python](https://www.python.org/) interpreter.
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* [User Guide](https://pyo3.github.io/pyo3/guide/)
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* [API Documentation](http://pyo3.github.io/pyo3/pyo3/)
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* Cargo package: [pyo3](https://crates.io/crates/pyo3)
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---
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PyO3 is licensed under the [Apache-2.0 license](http://opensource.org/licenses/APACHE-2.0).
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Python is licensed under the [Python License](https://docs.python.org/2/license.html).
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Supported Python versions:
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* Python 2.7, Python 3.5 and up
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Supported Rust version:
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* Rust 1.23.0-nightly 2017-11-07 or later
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## Usage
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To use `pyo3`, add this to your `Cargo.toml`:
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```toml
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[dependencies]
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pyo3 = "0.2"
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```
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Example program displaying the value of `sys.version`:
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```rust
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extern crate pyo3;
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use pyo3::{Python, PyDict, PyResult, ObjectProtocol};
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fn main() {
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let gil = Python::acquire_gil();
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hello(gil.python()).unwrap();
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}
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fn hello(py: Python) -> PyResult<()> {
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let sys = py.import("sys")?;
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let version: String = sys.get("version")?.extract()?;
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let locals = PyDict::new(py);
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locals.set_item("os", py.import("os")?)?;
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let user: String = py.eval("os.getenv('USER') or os.getenv('USERNAME')", 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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Example library with python bindings:
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The following two files will build with `cargo build`, and will generate a python-compatible library.
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For MacOS, "-C link-arg=-undefined -C link-arg=dynamic_lookup" is required to build the library.
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`setuptools-rust` includes this by default.
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See [examples/word-count](examples/word-count) and the associated setup.py.
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Also on macOS, you will need to rename the output from \*.dylib to \*.so.
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On Windows, you will need to rename the output from \*.dll to \*.pyd.
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**`Cargo.toml`:**
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```toml
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[lib]
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name = "rust2py"
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crate-type = ["cdylib"]
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[dependencies.pyo3]
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version = "0.2"
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features = ["extension-module"]
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```
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**`src/lib.rs`**
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```rust
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#![feature(proc_macro, specialization)]
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extern crate pyo3;
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use pyo3::prelude::*;
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use pyo3::py::modinit as pymodinit;
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// add bindings to the generated python module
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// N.B: names: "librust2py" must be the name of the `.so` or `.pyd` file
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/// This module is implemented in Rust.
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#[pymodinit(rust2py)]
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fn init_mod(py: Python, m: &PyModule) -> PyResult<()> {
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#[pyfn(m, "sum_as_string")]
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// pyo3 aware function. All of our python interface could be declared in a separate module.
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// Note that the `#[pyfn()]` annotation automatically converts the arguments from
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// Python objects to Rust values; and the Rust return value back into a Python object.
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fn sum_as_string_py(a:i64, b:i64) -> PyResult<String> {
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let out = sum_as_string(a, b);
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Ok(out)
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}
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Ok(())
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}
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// logic implemented as a normal rust function
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fn sum_as_string(a:i64, b:i64) -> String {
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format!("{}", a + b).to_string()
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}
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```
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For `setup.py` integration, see [setuptools-rust](https://github.com/PyO3/setuptools-rust)
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**This is fork of rust-cpython project https://github.com/dgrunwald/rust-cpython**
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[Motivation for fork](https://github.com/PyO3/pyo3/issues/55)
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