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 — replaces pyenv + pip + venv + pip-tools
• Deterministic — lock file ensures same versions everywhere
• Fast — uses uv under the hood (Rust-based, 10x faster)
• By Flask creator — designed by someone who understands Python

A Python project had "works on my machine" bugs from different pip versions. After Rye: one rye sync command, everyone has identical environments, zero dependency conflicts.

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