uv

uv is a Python package and project manager written in Rust. It handles dependency installation, virtual environments, Python version management, and project builds in a single tool, replacing the need for separate tools like pip, pip-tools, virtualenv, and pyenv. It resolves and installs packages significantly faster than pip because of its Rust-based resolver and aggressive caching. Developers use it to create isolated environments, lock dependencies for reproducible builds, and run scripts with inline dependency declarations.