Rye Has a Free Python Project Manager — One Tool for Python Versions, Packages, and Virtual Environments

Rye is an all-in-one Python project manager by Armin Ronacher (Flask creator) — manages Python versions, virtual environments, and packages. What You Get for Free Python version management — install any Python version Virtual environments — automatic venv creation Package management — add/remove/sync dependencies Lock files — reproducible builds with lock file Scripts — define and run project scripts Workspaces — monorepo support Build — build and publish packages to PyPI Global tools — install CLI tools without polluting environments Quick Start curl -sSf https://rye.astral.sh/get | bash rye init my-project && cd my-project rye add flask requests rye sync # creates venv + installs everything rye run python app.py # pyproject.toml (managed by rye) [project] name = "my-project" dependencies = ["flask> = 3.0 ", " requests> = 2.31 "] [tool.rye.scripts] dev = "flask run --debug" test = "pytest" Why Developers Switch from pip + pyenv + venv 3 separate tools that don't integrate: One tool —