Add sample code for How to Set Up a Python Project for Agentic Coding

[realpython-bot]

Sample code for the tutorial "How to Set Up a Python Project for Agentic Coding" (CMS Post 2244, Trello card 1546).

This fills the Materials PR slot on the card, which was still XXX.

Contents

The finished project from the tutorial, in a uv init --package layout:

File	Purpose
pyproject.toml	Dependencies plus Ruff, mypy, and pytest configuration
src/ai_agent_project/__init__.py	The double() function the tutorial builds
tests/test_main.py	The passing test behind the coverage gate
.pre-commit-config.yaml	ruff-check, ruff-format, and mypy hooks
AGENTS.md	The agent instructions from Step 3
.env.example	Placeholder env vars, per the secrets section
README.md	Setup and how to run each check

Verification

Run against uv 0.11.26:

• uv run pytest passes at 100% coverage, clearing the --cov-fail-under=90 gate
• uv run mypy . is clean under strict = true
• uv run ruff check . and uv run ruff format --check . are clean
• uv run pre-commit run --all-files passes all three hooks

Why it is needed now

The article's opt-in (python-project-for-agentic-coding-code) points its download URL at materials/python-project-for-agentic-coding. Until this merges, that URL returns 404 and the article's CMS preflight reports a URLFieldValidationError.

🤖 Generated with Claude Code

[acsany]

Approving. Verified against uv 0.11.26: pytest passes at 100% coverage clearing the 90% gate, mypy is clean under strict, Ruff check and format are clean, and all three pre-commit hooks pass. Contents match the finished project in the tutorial.