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An extremely fast Python package and project manager, written in Rust. fyn is an independent Python package manager built on uv's foundation, with reduced package-index request metadata, new features added, and long-standing bugs fixed. See MANIFESTO.md for the full story. A single tool to replace pip, pip-tools, pipx, poetry, pyenv, twine, virtualenv, and more. 10-100x faster than pip. Provides c