# uv

[![uv](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/uv/main/assets/badge/v0.json)](https://github.com/astral-sh/uv)
[![image](https://img.shields.io/pypi/v/uv.svg)](https://pypi.python.org/pypi/uv)
[![image](https://img.shields.io/pypi/l/uv.svg)](https://pypi.python.org/pypi/uv)
[![image](https://img.shields.io/pypi/pyversions/uv.svg)](https://pypi.python.org/pypi/uv)
[![Actions status](https://github.com/astral-sh/uv/actions/workflows/ci.yml/badge.svg)](https://github.com/astral-sh/uv/actions)
[![Discord](https://img.shields.io/badge/Discord-%235865F2.svg?logo=discord&logoColor=white)](https://discord.gg/astral-sh)

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

<p align="center">
  <picture align="center">
    <source media="(prefers-color-scheme: dark)" srcset="https://github.com/astral-sh/uv/assets/1309177/03aa9163-1c79-4a87-a31d-7a9311ed9310">
    <source media="(prefers-color-scheme: light)" srcset="https://github.com/astral-sh/uv/assets/1309177/629e59c0-9c6e-4013-9ad4-adb2bcf5080d">
    <img alt="Shows a bar chart with benchmark results." src="https://github.com/astral-sh/uv/assets/1309177/629e59c0-9c6e-4013-9ad4-adb2bcf5080d">
  </picture>
</p>

<p align="center">
  <i>Installing <a href="https://trio.readthedocs.io/">Trio</a>'s dependencies with a warm cache.</i>
</p>

## Highlights

- 🚀 A single tool to replace `pip`, `pip-tools`, `pipx`, `poetry`, `pyenv`, `virtualenv`, and more.
- ⚡️ [10-100x faster](https://github.com/astral-sh/uv/blob/main/BENCHMARKS.md) than `pip`.
- 🐍 [Installs and manages](#python-management) Python versions.
- 🛠️ [Runs and installs](#tool-management) Python applications.
- ❇️ [Runs single-file scripts](#script-support), with support for
  [inline dependency metadata](https://docs.astral.sh/uv/guides/scripts#declaring-script-dependencies).
- 🗂️ Provides [comprehensive project management](#project-management), with a
  [universal lockfile](https://docs.astral.sh/uv/concepts/projects#project-lockfile).
- 🔩 Includes a [pip-compatible interface](#a-pip-compatible-interface) for a performance boost with
  a familiar CLI.
- 🏢 Supports Cargo-style [workspaces](https://docs.astral.sh/uv/concepts/workspaces) for scalable
  projects.
- 💾 Disk-space efficient, with a [global cache](https://docs.astral.sh/uv/concepts/cache) for
  dependency deduplication.
- ⏬ Installable without Rust or Python via `curl` or `pip`.
- 🖥️ Supports macOS, Linux, and Windows.

uv is backed by [Astral](https://astral.sh), the creators of
[Ruff](https://github.com/astral-sh/ruff).

## Installation

Install uv with our standalone installers, or from [PyPI](https://pypi.org/project/uv/):

```console
# On macOS and Linux.
$ curl -LsSf https://astral.sh/uv/install.sh | sh

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

# With pip.
$ pip install uv
```

See the [installation documentation](https://docs.astral.sh/uv/getting-started/installation/) for
details and alternative installation methods.

## Documentation

uv's documentation is available at [docs.astral.sh/uv](https://docs.astral.sh/uv).

Additionally, the command line reference documentation can be viewed with `uv help`.

## Features

### Project management

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

```console
$ 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 documentation](https://docs.astral.sh/uv/guides/projects/) 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`):

```console
$ 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`:

```console
$ 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 documentation](https://docs.astral.sh/uv/guides/tools/) to get started.

### Python management

uv installs Python and allows quickly switching between versions.

Install multiple Python versions:

```console
$ 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:

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

$ uv run --python pypy@3.8 -- 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:

```console
$ uv python pin pypy@3.11
Pinned `.python-version` to `pypy@3.11`
```

See the [Python installation documentation](https://docs.astral.sh/uv/guides/install-python/) 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:

```console
$ 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:

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

See the [scripts documentation](https://docs.astral.sh/uv/guides/scripts/) to get started.

### A pip-compatible 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:

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

Create a virtual environment:

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

Install the locked requirements:

```console
$ 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](https://docs.astral.sh/uv/pip/index/) to get started.

## Platform support

See uv's [platform support](https://docs.astral.sh/uv/reference/platforms/) document.

## Versioning policy

See uv's [versioning policy](https://docs.astral.sh/uv/reference/versioning/) document.

## Contributing

We are passionate about supporting contributors of all levels of experience and would love to see
you get involved in the project. See the
[contributing guide](https://github.com/astral-sh/uv/blob/main/CONTRIBUTING.md) to get started.

## Acknowledgements

uv's dependency resolver uses [PubGrub](https://github.com/pubgrub-rs/pubgrub) under the hood. We're
grateful to the PubGrub maintainers, especially [Jacob Finkelman](https://github.com/Eh2406), for
their support.

uv's Git implementation is based on [Cargo](https://github.com/rust-lang/cargo).

Some of uv's optimizations are inspired by the great work we've seen in [pnpm](https://pnpm.io/),
[Orogene](https://github.com/orogene/orogene), and [Bun](https://github.com/oven-sh/bun). We've also
learned a lot from Nathaniel J. Smith's [Posy](https://github.com/njsmith/posy) and adapted its
[trampoline](https://github.com/njsmith/posy/tree/main/src/trampolines/windows-trampolines/posy-trampoline)
for Windows support.

## License

uv is licensed under either of

- Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
  https://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or https://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in uv
by you, as defined in the Apache-2.0 license, shall be dually licensed as above, without any
additional terms or conditions.

<div align="center">
  <a target="_blank" href="https://astral.sh" style="background:none">
    <img src="https://raw.githubusercontent.com/astral-sh/uv/main/assets/svg/Astral.svg" alt="Made by Astral">
  </a>
</div>
