Python package template

This is a template repository for any Python package that comes with the following dev tools:

• ruff: identifies many errors and style issues (flake8, isort, pyupgrade)
• black: auto-formats code
• mypy: static type checker

Those checks are run as pre-commit hooks using the pre-commit library.

It includes pytest for testing plus the pytest-cov plugin to measure coverage.

The checks and tests are all run using Github actions on every pull request and merge to main.

This repository is setup for Python 3.12. To change the version:

1. Change the image argument in .devcontainer/devcontainer.json (see https://github.com/devcontainers/images/tree/main/src/python for a list of pre-built Docker images)
2. Change the config options in .precommit-config.yaml
3. Change the config options in .pyproject.toml
4. Change the version number in .github/workflows/

Development instructions

With devcontainer

This repository comes with a devcontainer (a Dockerized Python environment). If you open it in Codespaces, it should automatically initialize the devcontainer.

Locally, you can open it in VS Code with the Dev Containers extension installed.

Without devcontainer

If you can't or don't want to use the devcontainer, then you should first create a virtual environment:

python3 -m venv .venv
source .venv/bin/activate

Then install the dev tools and pre-commit hooks:

python3 -m pip install -e '.[dev]'
pre-commit install

Adding code and tests

This repository starts with a very simple main.py and a test for it at tests/test_main_module.py. You'll want to replace that with your own code, and you'll probably want to add additional files as your code grows in complexity.

When you're ready to run tests, run:

python3 -m pytest

File breakdown

Here's a short explanation of each file/folder in this template:

• .devcontainer: Folder containing files used for setting up a devcontainer
  • devcontainer.json: File configuring the devcontainer, includes VS Code settings
• .github: Folder for Github-specific files and folders
  • workflows: Folder containing Github actions config files
• tests: Folder containing Python tests
  • test_main_module.py: File with pytest-style tests of main.py
• .gitignore: File describing what file patterns Git should never track
• .pre-commit-config.yaml: File listing all the pre-commit hooks and args
• src: Folder containing the source files for your Python package.
  • python_package_template: Folder containing the package.
    • py.typed: File to force mypy to analyze package types.
    • __init__.py: File to specify that this is a Python module.
    • main.py: The main (and currently only) Python file for the program.
• CHANGELOG.md: File to log the significant changes to the package between releases.
• pyproject.toml: File configuring most of the Python dev tools
• README.md: You're reading it!

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