RustPython

A Python-3 (CPython >= 3.5.0) Interpreter written in Rust 🐍 😱 🤘.

Usage

Check out our online demo running on WebAssembly.

To test RustPython, do the following:

$ git clone https://github.com/RustPython/RustPython
$ cd RustPython
$ cargo run demo.py
Hello, RustPython!

Or use the interactive shell:

$ cargo run
Welcome to rustpython
>>>>> 2+2
4

Disclaimer

RustPython is in a development phase and should not be used in production or a fault intolerant setting.

Our current build supports only a subset of Python syntax.

Contribution is also more than welcome! See our contribution section for more information on this.

Goals

• Full Python-3 environment entirely in Rust (not CPython bindings)
• A clean implementation without compatibility hacks

Documentation

Currently along with other areas of the project, documentation is still in an early phase.

You can read the online documentation for the latest code on master.

You can also generate documentation locally by running:

$ cargo doc # Including documentation for all dependencies
$ cargo doc --no-deps --all # Excluding all dependencies

Documentation HTML files can then be found in the target/doc directory.

If you wish to update the online documentation, push directly to the release branch (or ask a maintainer to do so). This will trigger a Travis build that updates the documentation and WebAssembly demo page.

Code organization

• parser/src: python lexing, parsing and ast
• vm/src: python virtual machine
  • builtins.rs: Builtin functions
  • compile.rs: the python compiler from ast to bytecode
  • obj: python builtin types
• src: using the other subcrates to bring rustpython to life.
• docs: documentation (work in progress)
• py_code_object: CPython bytecode to rustpython bytecode converter (work in progress)
• wasm: Binary crate and resources for WebAssembly build
• tests: integration test snippets

Contributing

Contributions are more than welcome, and in many cases we are happy to guide contributors through PRs or on gitter.

With that in mind, please note this project is maintained by volunteers, some of the best ways to get started are below:

Most tasks are listed in the issue tracker. Check issues labeled with good first issue if you wish to start coding.

Another approach is to checkout the source code: builtin functions and object methods are often the simplest and easiest way to contribute.

You can also simply run ./whats_left.sh to assist in finding any unimplemented method.

Testing

To test rustpython, there is a collection of python snippets located in the tests/snippets directory. To run those tests do the following:

$ cd tests
$ pipenv install
$ pipenv run pytest -v

There also are some unit tests, you can run those with cargo:

$ cargo test --all

Using a standard library

As of now the standard library is under construction. You can use a standard library by setting the RUSTPYTHONPATH environment variable.

To do this, follow this method:

$ export RUSTPYTHONPATH=~/GIT/RustPython/Lib
$ cargo run -- -c 'import xdrlib'

You can play around with other standard libraries for python. For example, the ouroboros library.

Compiling to WebAssembly

See this doc

Code style

The code style used is the default rustfmt codestyle. Please format your code accordingly. We also use clippy to detect rust code issues.

Community

Chat with us on gitter.

Code of conduct

Our code of conduct can be found here.

Credit

The initial work was based on windelbouwman/rspython and shinglyu/RustPython

Links

These are some useful links to related projects:

• https://github.com/ProgVal/pythonvm-rust
• https://github.com/shinglyu/RustPython
• https://github.com/windelbouwman/rspython