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https://github.com/dgrunwald/rust-cpython

Rust <-> Python bindings
https://github.com/dgrunwald/rust-cpython

Last synced: 7 days ago
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Rust <-> Python bindings

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README 

        
rust-cpython [![Build Status](https://github.com/dgrunwald/rust-cpython/actions/workflows/test.yml/badge.svg)](https://github.com/dgrunwald/rust-cpython/actions/workflows/test.yml)

====================



Warning: this package is no longer actively maintained.

Please switch to [PyO3](https://github.com/PyO3/pyo3) instead.



[Rust](http://www.rust-lang.org/) bindings for the [python](https://www.python.org/) interpreter.



* [Documentation](http://dgrunwald.github.io/rust-cpython/doc/cpython/)

* Cargo package: [cpython](https://crates.io/crates/cpython)



---



Copyright (c) 2015-2021 Daniel Grunwald.

Rust-cpython is licensed under the [MIT license](http://opensource.org/licenses/MIT).

Python is licensed under the [Python License](https://docs.python.org/2/license.html).



Supported Python versions:

* Python 2.7

* Python 3.7 to 3.12



Warning: this package is no longer actively maintained.

Please switch to [PyO3](https://github.com/PyO3/pyo3) instead.



Requires Rust 1.41.1 or later.



# Usage



To use `cpython`, add this to your `Cargo.toml`:



```toml

[dependencies]

cpython = "0.7"

```



#### Example program displaying the value of `sys.version`:



```rust

use cpython::{Python, PyDict, PyResult};



fn main() {

    let gil = Python::acquire_gil();

    hello(gil.python()).unwrap();

}



fn hello(py: Python) -> PyResult<()> {

    let sys = py.import("sys")?;

    let version: String = sys.get(py, "version")?.extract(py)?;



    let locals = PyDict::new(py);

    locals.set_item(py, "os", py.import("os")?)?;

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



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

    Ok(())

}

```



#### Example library with python bindings:

The following two files will build with `cargo build`, and will generate a python-compatible library.

On Mac OS, you will need to rename the output from \*.dylib to \*.so.

On Windows, you will need to rename the output from \*.dll to \*.pyd.



###### Note:

At build time `python3-sys/build.rs` will look for interpreters in: 

* `PYTHON_SYS_EXECUTABLE`

* `python`

* `python3`



picking the first one that works and is compatible with the configured expected version (by default, any Python 3.X interpreter will do). If a specific interpreter is desired, the `PYTHON_SYS_EXECUTABLE` environment variable should point to it.



**`Cargo.toml`:**

```toml

[lib]

name = "rust2py"

crate-type = ["cdylib"]



[dependencies.cpython]

version = "0.7"

features = ["extension-module"]

```



**`src/lib.rs`**

```rust

use cpython::{PyResult, Python, py_module_initializer, py_fn};



// add bindings to the generated python module

// N.B: names: "rust2py" must be the name of the `.so` or `.pyd` file

py_module_initializer!(rust2py, |py, m| {

    m.add(py, "__doc__", "This module is implemented in Rust.")?;

    m.add(py, "sum_as_string", py_fn!(py, sum_as_string_py(a: i64, b:i64)))?;

    Ok(())

});



// logic implemented as a normal rust function

fn sum_as_string(a:i64, b:i64) -> String {

    format!("{}", a + b).to_string()

}



// rust-cpython aware function. All of our python interface could be

// declared in a separate module.

// Note that the py_fn!() macro automatically converts the arguments from

// Python objects to Rust values; and the Rust return value back into a Python object.

fn sum_as_string_py(_: Python, a:i64, b:i64) -> PyResult {

    let out = sum_as_string(a, b);

    Ok(out)

}

```



On windows and linux, you can build normally with cargo build --release. On Mac Os, you need to set additional linker arguments. The simplest solution is to create a `.cargo/config` with the following content:



```

[target.x86_64-apple-darwin]

rustflags = [

  "-C", "link-arg=-undefined",

  "-C", "link-arg=dynamic_lookup",

]

```



For `setup.py` integration, see https://github.com/PyO3/setuptools-rust



# Development



To build the crate, run: `make build`



To test the crate, run: `make test`



Note: This crate has several files that are auto-generated using scripts. Using the Makefile ensures that these

files are re-generated as needed.