uv
If the project uses uv, use this skill. Use this skill to create/manage Python projects and environments with `uv`, add/remove dependencies, sync a project from `uv.lock`, and run commands in the project environment.
What this skill does
# uv (Python) Use `uv` as the default tool for Python dependency + environment management when the repo has `uv.lock`, mentions `uv` in its docs/Makefile, or already uses a `.venv` created by `uv`. ## Quick decision rules - If the repo has `uv.lock` and `pyproject.toml`: treat it as a uv-managed project. - If the repo has only `requirements.txt`: you can still use `uv pip` for fast installs. - Prefer **project commands** (`uv add/remove/sync/run/lock`) over raw `pip` unless the repo explicitly uses `uv pip`. ## Installation (if needed) Prefer a packaged install method when available. If you use the official installer, review it first (avoid blindly piping into a shell) and follow the latest instructions in the official docs. ```bash # macOS/Linux (official installer) curl -LsSf https://astral.sh/uv/install.sh | sh # Windows (PowerShell, official installer) powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex" ``` ## Common operations ### Initialize a new project ```bash uv init # or uv init my-project ``` ### Create / use a virtual environment ```bash uv venv # creates .venv # If you need a specific version, match the project's declared requirement # (e.g., pyproject.toml / CI config), not an arbitrary latest version. uv venv --python 3.x # optional activation (not required for uv commands) source .venv/bin/activate # macOS/Linux # .venv\\Scripts\\activate # Windows ``` ### Add / remove dependencies (updates pyproject.toml and uv.lock) ```bash uv add requests uv add 'requests==2.31.0' uv add -r requirements.txt uv remove requests ``` ### Lock + sync (reproducible installs) ```bash uv lock # (re)generate uv.lock uv sync # create/update .venv to match uv.lock ``` If you pulled new changes and `uv.lock` changed, run `uv sync`. ### Run commands inside the project environment ```bash uv run python -m pytest -q uv run python main.py uv run ruff check . ``` ### Using uv as a fast pip replacement (requirements workflows) ```bash uv venv uv pip install -r requirements.txt uv pip freeze uv pip list ``` ## Notes / pitfalls - `uv` will usually auto-detect and use `.venv` in the project root. - In CI/containers you may see `uv pip install --system`, but prefer virtualenvs for local dev. - If a command mutates deps, prefer `uv add/remove/lock/sync` so `uv.lock` stays correct.
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