uv#

An extremely fast Python package and project manager, written in Rust.

Installing Trio's dependencies with a warm cache.

Highlights#

• 🚀 A single tool to replace pip, pip-tools, pipx, poetry, pyenv, virtualenv, and more.
• ⚡️ 10-100x faster than pip.
• 🐍 Installs and manages Python versions.
• 🛠️ Runs and installs Python applications.
• ❇️ Runs scripts, with support for inline dependency metadata.
• 🗂️ Provides comprehensive project management, with a universal lockfile.
• 🔩 Includes a pip-compatible interface for a performance boost with a familiar CLI.
• 🏢 Supports Cargo-style workspaces for scalable projects.
• 💾 Disk-space efficient, with a global cache for dependency deduplication.
• ⏬ Installable without Rust or Python via curl or pip.
• 🖥️ Supports macOS, Linux, and Windows.

uv is backed by Astral, the creators of Ruff.

Getting started#

Install uv with our official standalone installer:

$ curl -LsSf https://astral.sh/uv/install.sh | sh

$ powershell -c "irm https://astral.sh/uv/install.ps1 | iex"

Then, check out the first steps or read on for a brief overview.

Project management#

uv manages project dependencies and environments, with support for lockfiles, workspaces, and more, similar to rye or poetry:

$ uv init example
Initialized project `example` at `/home/user/example`

$ cd example

$ uv add ruff
Creating virtualenv at: .venv
Resolved 2 packages in 170ms
   Built example @ file:///home/user/example
Prepared 2 packages in 627ms
Installed 2 packages in 1ms
 + example==0.1.0 (from file:///home/user/example)
 + ruff==0.5.4

$ uv run ruff check
All checks passed!

See the project guide to get started.

Tool management#

uv executes and installs command-line tools provided by Python packages, similar to pipx.

Run a tool in an ephemeral environment using uvx (an alias for uv tool run):

$ uvx pycowsay 'hello world!'
Resolved 1 package in 167ms
Installed 1 package in 9ms
 + pycowsay==0.0.0.2
  """

  ------------
< hello world! >
  ------------
   \   ^__^
    \  (oo)\_______
       (__)\       )\/\
           ||----w |
           ||     ||

Install a tool with uv tool install:

$ uv tool install ruff
Resolved 1 package in 6ms
Installed 1 package in 2ms
 + ruff==0.5.4
Installed 1 executable: ruff

$ ruff --version
ruff 0.5.4

See the tools guide to get started.

Python management#

uv installs Python and allows quickly switching between versions.

Install multiple Python versions:

$ uv python install 3.10 3.11 3.12
Searching for Python versions matching: Python 3.10
Searching for Python versions matching: Python 3.11
Searching for Python versions matching: Python 3.12
Installed 3 versions in 3.42s
 + cpython-3.10.14-macos-aarch64-none
 + cpython-3.11.9-macos-aarch64-none
 + cpython-3.12.4-macos-aarch64-none

Download Python versions as needed:

$ uv venv --python 3.12.0
Using Python 3.12.0
Creating virtualenv at: .venv
Activate with: source .venv/bin/activate

$ uv run --python [email protected] -- python --version
Python 3.8.16 (a9dbdca6fc3286b0addd2240f11d97d8e8de187a, Dec 29 2022, 11:45:30)
[PyPy 7.3.11 with GCC Apple LLVM 13.1.6 (clang-1316.0.21.2.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>>

Use a specific Python version in the current directory:

$ uv python pin [email protected]
Pinned `.python-version` to `[email protected]`

See the installing Python guide to get started.

Script support#

uv manages dependencies and environments for single-file scripts.

Create a new script and add inline metadata declaring its dependencies:

$ echo 'import requests; print(requests.get("https://astral.sh"))' > example.py

$ uv add --script example.py requests
Updated `example.py`

Then, run the script in an isolated virtual environment:

$ uv run example.py
Reading inline script metadata from: example.py
Installed 5 packages in 12ms
<Response [200]>

See the scripts guide to get started.

The pip interface#

uv provides a drop-in replacement for common pip, pip-tools, and virtualenv commands.

uv extends their interfaces with advanced features, such as dependency version overrides, platform-independent resolutions, reproducible resolutions, alternative resolution strategies, and more.

Migrate to uv without changing your existing workflows — and experience a 10-100x speedup — with the uv pip interface.

Compile requirements into a platform-independent requirements file:

$ uv pip compile docs/requirements.in \
   --universal \
   --output-file docs/requirements.txt
Resolved 43 packages in 12ms

Create a virtual environment:

$ uv venv
Using Python 3.12.3
Creating virtualenv at: .venv
Activate with: source .venv/bin/activate

Install the locked requirements:

$ uv pip sync docs/requirements.txt
Resolved 43 packages in 11ms
Installed 43 packages in 208ms
 + babel==2.15.0
 + black==24.4.2
 + certifi==2024.7.4
 ...

See the pip interface documentation to get started.

Learn more#

See the first steps or jump straight to the guides to start using uv.