Summary

I have python rust mixed pyo3 project (mypackage) which is built using maturin build-backend and I want to make certain Rust features compile only when optional Python dependencies (or “extras”) are installed.

I know what the dependencies and optional-dependencies section a pyproject.toml are to manipulate the included python packages. but I was wondering if there is a known pattern to use these to manipulate a feature gated (maturin) build itself.

Any help would be greatly appreciated, let me know if i need to raise this as a github issue.
thanks

Example

It'll be awesome for the end users to do something like :

# base build with default features
uv pip install mypackage           

# enables "fast" Rust feature + includes any other py dependencies in fast extra
uv pip install mypackage[fast]     

# enables "something" and "fast" Rust feature + includes any other py dependencies in "something" and "fast" extra
uv pip install mypackage[fast, something]    

and have those optional extras map to Cargo features in your Cargo.toml so that maturin knows to build with those features.