uv
Initializes Python projects, manages dependencies, pins Python versions, and runs scripts with uv. Use when adding/removing packages, syncing environments, running tools with uvx, or building distributions.
What this skill does
# uv Fast Python package and project manager — 10-100x faster than pip with built-in virtual environment management. ## Project Setup ```bash uv init my-app # App project uv init my-lib --lib # Library project uv init --script script.py # Standalone script uv python pin 3.11 # Pin Python version for the project ``` ## Managing Dependencies ```bash uv add requests # Add a dependency uv add --dev pytest # Add dev dependency uv add --optional ml scikit-learn # Add optional group uv remove requests # Remove a dependency uv lock # Update lockfile only uv export > requirements.txt # Export to pip format ``` Commit `uv.lock` for reproducibility. ## Syncing Environments ```bash uv sync # Install all dependencies uv sync --no-dev # Skip dev dependencies uv sync --all-extras # Include all optional groups uv sync --refresh # Recreate venv from scratch uv sync --locked # Fail if lockfile would change (CI-friendly) ``` ## Running Code ```bash uv run python script.py # Run a script with project deps available uv run -m pytest # Run a module uv run --with requests script.py # Add a one-off dependency uv run --extra ml train.py # Use optional dependencies uv run --env-file .env script.py # Load environment variables ``` `uv run` handles virtual environment creation automatically. ## Installing Tools ```bash uvx ruff check . # Run a tool once without installing uv tool install ruff # Install globally for reuse uv tool list # List installed tools uv tool upgrade ruff # Upgrade a tool ``` Tools are isolated from project dependencies. ## Building & Publishing ```bash uv build # Build source and wheel distributions uv publish # Publish to PyPI ``` ## Formatting ```bash uv format # Format Python code uv format --check # Check without changes ``` ## Project Versioning ```bash uv version 1.2.3 # Set version uv version --bump major # Bump major version ``` ## Typical CI Workflow ```bash uv sync --locked # Install deps from lockfile uv run pytest # Run tests uv run ruff check . # Lint ```
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