uv-package-manager

Use uv add to install packages and record them in pyproject.toml, or uv pip install for pip-compatible workflows. Running uv sync installs all dependencies from your lockfile into a virtual environment automatically.

Run uv venv to create a virtual environment in the current directory, optionally specifying a Python version with uv venv --python 3.12. You can then use uv run to execute commands without manually activating the environment.

uv is a Rust-based package installer that runs 10-100x faster than pip and includes a better dependency resolver. It also combines virtual environment management, Python installation, and lockfile support that pip does not provide natively.

Yes, uv reads existing pyproject.toml files including poetry-style configuration, so you can run uv sync directly. For pip-tools workflows, replace pip-compile with uv lock and pip-sync with uv sync --frozen.

Yes, uv lock generates a uv.lock file pinning exact dependency versions. Use uv sync --frozen in CI or Docker to install exactly those versions, and uv export to produce a requirements.txt with hashes.

The lockfile becomes stale when dependencies in pyproject.toml change without relocking. Run uv lock --upgrade to regenerate it, or uv lock --check to verify whether the lockfile matches your project configuration.