hello-c-extension
A minimal, working example of how to package a Python project that combines
pure-Python code with a C++ extension module — using modern
(PEP 517 / 621 / 639) pyproject.toml-based build configuration and the
uv +
task workflow.
The package cmod exposes:
| Name | Kind | Defined in |
|---|---|---|
cmod.CONSTANT |
package-level Python constant | src/cmod/__init__.py |
cmod.pymod |
pure-Python submodule | src/cmod/pymod.py |
cmod._cmod |
compiled C++ extension submodule | src/cmod/_cmodule.cc |
Install
python -m pip install hello-c-extension
Use
>>> from cmod import CONSTANT, pymod, _cmod
>>> CONSTANT
10
>>> pymod.hello()
Hello from Python!
>>> _cmod.foo()
5
Project layout
hello-c-extension/
├── pyproject.toml # PEP 621 metadata + ext-modules + tool config
├── uv.lock # reproducible dependency lock (committed)
├── Taskfile.yml # command shortcuts (task ...)
├── .pre-commit-config.yaml # hooks runnable via prek
├── CHANGELOG.md # Keep a Changelog
├── CLAUDE.md # guidance for AI-assisted development
├── .editorconfig
├── .github/
│ ├── dependabot.yml # weekly uv + github-actions updates
│ └── workflows/
│ ├── ci.yml # lint + matrix test + build
│ └── publish.yml # tag-triggered OIDC publish + Sigstore + release
├── src/cmod/
│ ├── __init__.py
│ ├── pymod.py # pure-Python submodule
│ ├── _cmodule.cc # C++ source for the compiled submodule
│ ├── _cmod.pyi # type stubs for the compiled submodule
│ └── py.typed # PEP 561 marker (shipped in wheel)
└── tests/
└── test_cext.py # pytest (unittest-style)
Development
Requires Python 3.10 - 3.14, uv,
task, and a C++-capable compiler.
task sync # create .venv and install project + dev deps
task test # pytest + coverage (>=75% enforced)
task lint # ruff check + ruff format --check + ty check
task format # auto-format and apply safe fixes
task build # uv build -> sdist + wheel into dist/
task hooks # run all pre-commit hooks via `uvx prek run --all-files`
task check # full verification: lint + tests + build
Pre-commit hooks
Run via prek (drop-in
pre-commit replacement; shares .pre-commit-config.yaml):
uvx prek install # install git hook
uvx prek run --all-files
Configured hooks: ruff, ruff-format, ty, markdownlint-cli2, and basic
hygiene (end-of-file fixer, trailing whitespace, check-ast, check-merge-conflict,
debug-statements, mixed-line-ending).
Build backend
This project uses setuptools as the PEP 517 build backend. Astral's
uv_build backend is pure-Python only and cannot compile C/C++ extensions,
so setuptools with declarative [[tool.setuptools.ext-modules]] is used
instead. uv still drives the developer workflow (env, deps, build, run).
Releasing
Releases are tag-driven. Pushing a v* tag triggers publish.yml:
- Build sdist + wheel with
uv build. - Export an SBOM (locked requirements) via
uv export. - Publish to PyPI using Trusted Publishing (OIDC) — no API token stored in the repo.
- Sign the distributions with Sigstore.
- Create a GitHub Release containing the signed distributions and SBOM.
All GitHub Actions are pinned to full commit SHAs. Jobs run with
least-privilege permissions: scopes. The pypi GitHub environment can be
configured with protection rules (required reviewers, wait timers) for an
extra manual gate on releases.
License
MIT - see LICENSE.
1 maintainer
Metadata
1 maintainer
Release files for hello-c-extension 0.6.0
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Source distribution (sdist)
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Built distributions (wheels)
Total release size: 198.5 kB
Release files / hello_c_extension-0.6.0.tar.gz
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