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docs: sync README and lib.rs examples

This commit is contained in:
David Hewitt 2021-08-02 22:29:37 +01:00
parent 5093c2939a
commit b66f539473
5 changed files with 92 additions and 54 deletions
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2
.github/workflows/ci.yml vendored
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@ -179,7 +179,7 @@ jobs:
- name: Test example extension modules
shell: bash
run: |
for example_dir in examples/*; do
for example_dir in examples/*/; do
tox -c $example_dir -e py
done
env:

2
Makefile
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@ -13,7 +13,7 @@ fmt:
clippy:
cargo clippy --features="num-bigint num-complex hashbrown serde" --tests -- -Dwarnings
cargo clippy --features="abi3 num-bigint num-complex hashbrown serde" --tests -- -Dwarnings
for example in examples/*; do cargo clippy --manifest-path $$example/Cargo.toml -- -Dwarnings || exit 1; done
for example in examples/*/; do cargo clippy --manifest-path $$example/Cargo.toml -- -Dwarnings || exit 1; done
lint: fmt clippy
@true

30
README.md
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@ -98,13 +98,13 @@ As well as with `maturin`, it is possible to build using [`setuptools-rust`](htt
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.
To install the Python shared library, if you are on Ubuntu, you can run:
To install the Python shared library on Ubuntu:
```bash
sudo apt install python3-dev
```
Start a new project with `cargo new`. Next, add `pyo3` to your `Cargo.toml` like this:
Start a new project with `cargo new` and add `pyo3` to the `Cargo.toml` like this:
```toml
[dependencies.pyo3]
@ -118,24 +118,18 @@ Example program displaying the value of `sys.version` and the current user name:
use pyo3::prelude::*;
use pyo3::types::IntoPyDict;
fn main() -> Result<(), ()> {
fn main() -> PyResult<()> {
Python::with_gil(|py| {
main_(py).map_err(|e| {
// We can't display Python exceptions via std::fmt::Display,
// so print the error here manually.
e.print_and_set_sys_last_vars(py);
})
})
}
let sys = py.import("sys")?;
let version: String = sys.get("version")?.extract()?;
fn main_(py: Python) -> PyResult<()> {
let sys = py.import("sys")?;
let version: String = sys.get("version")?.extract()?;
let locals = [("os", py.import("os")?)].into_py_dict(py);
let code = "os.getenv('USER') or os.getenv('USERNAME') or 'Unknown'";
let user: String = py.eval(code, None, Some(&locals))?.extract()?;
println!("Hello {}, I'm Python {}", user, version);
Ok(())
let locals = [("os", py.import("os")?)].into_py_dict(py);
let code = "os.getenv('USER') or os.getenv('USERNAME') or 'Unknown'";
let user: String = py.eval(code, None, Some(&locals))?.extract()?;
println!("Hello {}, I'm Python {}", user, version);
Ok(())
})
}
```

13
examples/README.md Normal file
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@ -0,0 +1,13 @@
# PyO3 Examples
These examples are a collection of toy extension modules built with PyO3. They are all tested using `tox` in PyO3's CI.
Below is a brief description of each of these:
| Example | Description |
| ------- | ----------- |
| `maturin-starter` | A template project which is configured to use [`maturin`](https://github.com/PyO3/maturin) for development. |
| `setuptools-rust-starter` | A template project which is configured to use [`setuptools_rust`](https://github.com/PyO3/setuptools-rust/) for development. |
| `word-count` | A quick performance comparison between word counter implementations written in each of Rust and Python. |
| `pyo3-benchmarks` | A project containing some benchmarks of PyO3 functionality called from Python. |
| `pyo3-pytests` | A project containing some tests of PyO3 functionality called from Python. |

99
src/lib.rs
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@ -124,13 +124,13 @@
//!
//! # Example: Building a native Python module
//!
//! To build, test and publish your crate as a Python module, it is recommended that you use
//! [maturin](https://github.com/PyO3/maturin) or
//! [setuptools-rust](https://github.com/PyO3/setuptools-rust). You can also do this manually. See the
//! [Building and Distribution chapter of the guide](https://pyo3.rs/latest/building_and_distribution.html)
//! for more information.
//! 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 set up some files for an example Python module, install `maturin`, and then show how build
//! and import the Python module.
//!
//! Add these files to your crate's root:
//! First, create a new folder (let's call it `string_sum`) containing the following two files:
//!
//! **`Cargo.toml`**
//!
@ -176,30 +176,46 @@
//! }
//! ```
//!
//! **`.cargo/config.toml`**
//! ```toml
//! # These flags must be passed to rustc when compiling for macOS
//! # They can be omitted if you pass the flags yourself
//! # or don't care about macOS
//! With those two files in place, now `maturin` needs to be installed. This can be done using
//! Python's package manager `pip`. First, load up a new Python `virtualenv`, and install `maturin`
//! into it:
//!
//! [target.x86_64-apple-darwin]
//! rustflags = [
//! "-C", "link-arg=-undefined",
//! "-C", "link-arg=dynamic_lookup",
//! ]
//!
//! [target.aarch64-apple-darwin]
//! rustflags = [
//! "-C", "link-arg=-undefined",
//! "-C", "link-arg=dynamic_lookup",
//! ]
//! ```bash
//! $ cd string_sum
//! $ python -m venv .env
//! $ source .env/bin/activate
//! $ pip install maturin
//! ```
//!
//! Now build and execute the module:
//!
//! ```bash
//! $ maturin develop
//! # lots of progress output as maturin runs the compilation...
//! $ python
//! >>> import string_sum
//! >>> string_sum.sum_as_string(5, 20)
//! '25'
//! ```
//!
//! 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 further configuration.
//!
//! # Example: Using Python from Rust
//!
//! You can use PyO3 to call Python functions from Rust.
//! 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.
//!
//! Add `pyo3` to your `Cargo.toml`:
//! To install the Python shared library on Ubuntu:
//!
//! ```bash
//! sudo apt install python3-dev
//! ```
//!
//! Start a new project with `cargo new` and add `pyo3` to the `Cargo.toml` like this:
//!
//! ```toml
//! [dependencies.pyo3]
@ -210,26 +226,41 @@
//! features = ["auto-initialize"]
//! ```
//!
//! Example program displaying the value of `sys.version`:
//! Example program displaying the value of `sys.version` and the current user name:
//!
//! ```rust
//! use pyo3::prelude::*;
//! use pyo3::types::IntoPyDict;
//!
//! fn main() -> PyResult<()> {
//! let gil = Python::acquire_gil();
//! let py = gil.python();
//! let sys = py.import("sys")?;
//! let version: String = sys.get("version")?.extract()?;
//! Python::with_gil(|py| {
//! let sys = py.import("sys")?;
//! let version: String = sys.get("version")?.extract()?;
//!
//! let locals = [("os", py.import("os")?)].into_py_dict(py);
//! let code = "os.getenv('USER') or os.getenv('USERNAME') or 'Unknown'";
//! let user: String = py.eval(code, None, Some(&locals))?.extract()?;
//! let locals = [("os", py.import("os")?)].into_py_dict(py);
//! let code = "os.getenv('USER') or os.getenv('USERNAME') or 'Unknown'";
//! let user: String = py.eval(code, None, Some(&locals))?.extract()?;
//!
//! println!("Hello {}, I'm Python {}", user, version);
//! Ok(())
//! println!("Hello {}, I'm Python {}", user, version);
//! Ok(())
//! })
//! }
//! ```
//!
//! The guide has [a section](https://pyo3.rs/latest/python_from_rust.html) with lots of examples
//! about this topic.
//!
//! # Other Examples
//!
//! The PyO3 [README](https://github.com/PyO3/pyo3#readme) contains quick-start examples for both
//! using [Rust from Python](https://github.com/PyO3/pyo3#using-rust-from-python) and
//! [Python from Rust](https://github.com/PyO3/pyo3#using-python-from-rust).
//!
//! The PyO3 repository's [examples subdirectory](https://github.com/PyO3/pyo3/tree/main/examples)
//! contains some basic packages to demonstrate usage of PyO3.
//!
//! There are many projects using PyO3 - see a list of some at
//! <https://github.com/PyO3/pyo3#examples>
pub use crate::class::*;
pub use crate::conversion::{