uv

uv: Modern Python Package and Project Manager

Overview

uv is Astral's extremely fast Python package and project manager written in Rust, designed as a unified replacement for pip, pip-tools, pipx, poetry, pyenv, and virtualenv. It delivers 10-100x faster performance while providing modern dependency management with lockfiles and reproducible environments.

When to Use This Skill

Use this skill when:

• Initializing new Python projects or scripts
• Managing project dependencies with pyproject.toml
• Creating portable single-file scripts with PEP 723 inline metadata
• Installing or running command-line tools (ruff, black, httpie, etc.)
• Managing Python interpreter versions
• Setting up virtual environments
• Configuring package indexes or private registries
• Migrating from pip, pip-tools, poetry, or conda
• Configuring CI/CD pipelines for Python projects
• Setting up Docker containers for Python applications
• Troubleshooting dependency resolution or build failures

Migration Quick Reference

If you're coming from another tool, here's the fast lookup:

Old Tool	Old Command	uv Equivalent
pip	pip install X	uv add X
pip	pip install -r requirements.txt	uv add -r requirements.txt
pip	python -m pip install --upgrade X	uv add X (updates pyproject.toml + lockfile)
pip-tools	pip-compile	uv pip compile
pip-tools	pip-sync	uv pip sync
pipx	pipx run ruff	uvx ruff
pipx	pipx install ruff	uv tool install ruff
pipx	pipx upgrade ruff	uv tool upgrade ruff
pyenv	pyenv install 3.12	uv python install 3.12
pyenv	pyenv local 3.12	uv python pin 3.12
pyenv	pyenv global 3.12	uv python install 3.12 --default
poetry	poetry add X	uv add X
poetry	poetry add -D X	uv add --dev X
poetry	poetry install	uv sync
poetry	poetry run X	uv run X
poetry	poetry shell	N/A — use uv run instead
virtualenv	python -m venv .venv	uv venv
conda	conda install X	uv add X

For full step-by-step migration workflows, see references/migration-guide.md.

Core Capabilities

Consult ../python3-core/references/python3-standards.md when applying shared architecture, typing, testing, or CLI rules; full standards, graphs, and amendment process are documented there.

1. Project Initialization and Management

Initialize new projects:

# Standard project with recommended structure
uv init myproject

# Application project (default)
uv init myapp --app

# Library/package project (includes src/ layout)
uv init mylib --lib --build-backend hatchling

# Bare project (pyproject.toml only)
uv init --bare

Project structure created:

myproject/
├── .venv/           # Virtual environment (auto-created)
├── .python-version  # Pinned Python version
├── README.md
├── main.py          # Sample entry point
├── pyproject.toml   # Project metadata and dependencies
└── uv.lock          # Lockfile (like Cargo.lock or package-lock.json)

2. Dependency Management

Add dependencies to project:

# Production dependencies
uv add requests 'flask>=2.0,<3.0' pydantic

# With automatic version bounds (stable in 0.10.0)
uv add --bounds compatible requests  # Adds requests>=2.31,<3
uv add --bounds exact flask          # Adds flask==3.0.0

# Development dependencies
uv add --dev pytest pytest-cov ruff mypy black

# Optional dependency groups
uv add --group docs sphinx sphinx-rtd-theme
uv add --group test pytest-asyncio hypothesis

# From various sources
uv add git+https://github.com/psf/requests@main
uv add --editable ./local-package
uv add ../sibling-package

Remove dependencies:

uv remove requests flask
uv remove --dev pytest
uv remove --group docs sphinx

Lock and sync environments:

# Update lockfile with latest compatible versions
uv lock

# Upgrade all packages
uv lock --upgrade

# Upgrade specific packages
uv lock --upgrade-package requests --upgrade-package flask

# Install all dependencies from lockfile
uv sync

# Install without dev dependencies (production)
uv sync --no-dev

# Install with optional groups
uv sync --extra docs --extra test
uv sync --extra docs,test  # Comma-separated (0.9.30+)

# Sync without updating lockfile (CI mode)
uv sync --frozen

# Error if lockfile out of sync (strict CI mode)
uv sync --locked

3. Running Code in Project Context

Execute scripts and commands:

# Run Python script in project environment
uv run python script.py

# Run module (like python -m)
uv run -m pytest
uv run -m flask run --port 8000

# Run with specific Python version
uv run --python 3.11 script.py
uv run --python pypy@3.9 test.py

# Run without syncing first (use current environment state)
uv run --frozen script.py

# Run with additional temporary dependencies
uv run --with httpx --with rich script.py

# Run without project dependencies (standalone)
uv run --no-project example.py

# Run with environment variables from file
uv run --env-file .env script.py

4. PEP 723 Inline Script Metadata

Create portable single-file scripts with dependencies:

# Initialize script with metadata block
uv init --script example.py --python 3.12

# Add dependencies to existing script
uv add --script example.py requests rich

Example script structure:

#!/usr/bin/env -S uv --quiet run --active --script
# /// script
# requires-python = ">=3.11"
# dependencies = [
#   "requests>=2.31",
#   "rich>=13.0",
# ]
# ///

import requests
from rich import print

response = requests.get("https://api.github.com/repos/astral-sh/uv")
print(f"Stars: {response.json()['stargazers_count']}")

Run scripts:

# Auto-creates isolated environment and runs
uv run example.py

# Run with additional dependencies
uv run --with beautifulsoup4 example.py

# Lock script for reproducibility
uv lock --script example.py  # Creates example.py.lock

# Make executable and run directly
chmod +x example.py
./example.py

Best practices for scripts:

• Always include requires-python for compatibility
• Use version constraints for critical dependencies
• Lock scripts before sharing for reproducibility
• Add exclude-newer in [tool.uv] for time-based pinning (supports relative durations like "2 days ago" or "1w" since 0.9.17)

5. Tool Management

One-off tool execution (ephemeral environments):

# Run tool without installing (uvx is alias)
uvx ruff check
uvx pycowsay "hello from uv"

# Run specific version
uvx ruff@0.3.0 check
uvx --from 'ruff>=0.3.0,<0.4.0' ruff check

# Run tool from different package
uvx --from httpie http GET example.com

# Run with plugin/additional dependencies
uvx --with mkdocs-material mkdocs serve

Persistent tool installation:

# Install tool globally (adds to PATH)
uv tool install ruff black mypy

# Install with version constraint
uv tool install 'httpie>0.1.0'

# Install from git
uv tool install git+https://github.com/httpie/cli

# Install with additional packages
uv tool install mkdocs --with mkdocs-material

# Upgrade tools
uv tool upgrade ruff
uv tool upgrade --all

# List installed tools
uv tool list
uv tool list --show-paths

# Uninstall tool
uv tool uninstall ruff

# Update shell configuration for tools
uv tool update-shell

6. Python Version Management

Install and manage Python versions:

# Install specific Python version (auto-downloads if needed)
uv python install 3.12
uv python install 3.11 3.12 3.13  # Multiple at once

# Install and compile standard library bytecode (0.9.25+)
uv python install --compile-bytecode 3.12

# Request GIL-enabled interpreter for free-threaded Python (0.9.8+)
uv python install 3.13+gil

# List available versions
uv python list
uv python list --all-versions

# Pin Python version for project
uv python pin 3.12  # Creates .python-version
uv python pin --global 3.12  # Global pin

# Find Python executable
uv python find 3.11

# Upgrade Python installations (stable in 0.10.0)
uv python upgrade 3.11
uv python upgrade --all
uv python upgrade --compile-bytecode 3.11

# Use specific Python for command
uv run --python 3.11 script.py
uv venv --python 3.12.0

Python is automatically downloaded when needed:

• Supports CPython, PyPy, GraalPy, Pyodide, and other implementations
• Managed installations stored in ~/.local/share/uv/python/ (Unix)
• Preference configurable: only-managed, managed, system, only-system
• 0.10.0 change: Alternative implementations (PyPy, GraalPy, Pyodide) now install executables under their implementation name (e.g., pypy3.10 instead of python3.10)

7. Virtual Environment Management

Create virtual environments:

# Create in .venv directory (default)
uv venv

# Clear and recreate existing environment (required since 0.10.0)
uv venv --clear

# Create with specific Python version
uv venv --python 3.11
uv venv --python pypy3.9

# Create with custom path
uv venv myenv

# Create with system packages access
uv venv --system-site-packages

# Create with seed packages (pip, setuptools, wheel)
uv venv --seed

# Activate (standard Python activation)
source .venv/bin/activate  # Unix
.venv\Scripts\activate     # Windows

Warning (changed in 0.10.0): uv venv now refuses to overwrite an existing environment. Pass --clear (or set UV_VENV_CLEAR=1) to remove and recreate it.

8. pip-Compatible Interface

Direct pip replacement commands:

# Install packages
uv pip install flask requests
uv pip install -r requirements.txt
uv pip install -e .  # Editable install

# Install from git
uv pip install git+https://github.com/psf/requests
uv pip install git+https://github.com/pallets/flask@main

# Compile requirements (like pip-compile)
uv pip compile pyproject.toml -o requirements.txt
uv pip compile requirements.in -o requirements.txt
uv pip compile --upgrade-package ruff requirements.in

# Sync environment to exact requirements (like pip-sync)
uv pip sync requirements.txt

# Uninstall packages
uv pip uninstall flask requests
uv pip uninstall -r requirements.txt

# List installed packages
uv pip list
uv pip list --format json
uv pip freeze > requirements.txt
uv pip freeze --exclude setuptools --exclude pip  # Exclude packages (0.9.27+)

# Show package info
uv pip show requests

# Check for conflicts
uv pip check

# Display dependency tree
uv pip tree
uv pip tree --depth 2

# Check if package is installed
uv pip freeze | grep -q '^requests=='
uv pip list --format json | jq -e '.[] | select(.name == "requests")'
uv pip show requests

Package check benchmarks (76 packages installed):

Command	Time	Output Size
uv pip freeze	~8ms	~1.5 KB
uv pip list	~10ms	~2.5 KB
uv pip list --format json	~10ms	~3.2 KB
uv pip show <pkg>	~40ms	~0.3 KB

uv pip show is slower because it resolves Requires and Required-by relationships.

9. Workspace Management (Monorepos)

Configure workspaces in root pyproject.toml:

[tool.uv.workspace]
members = ["packages/*", "apps/*"]
exclude = ["packages/deprecated"]

Workspace dependency references:

[project]
name = "myapp"
dependencies = ["shared-lib", "core-utils"]

[tool.uv.sources]
shared-lib = { workspace = true }
core-utils = { workspace = true }

Workspace commands:

# Build specific workspace package
uv build --package my-package

# Run in workspace package context
uv run --package my-package python script.py

# Lock workspace (single lockfile for all members)
uv lock

10. Workspace Commands (Stable in 0.10.0)

List and inspect workspace members:

# List all workspace members
uv workspace list

# Show workspace member paths
uv workspace list --paths

# Print workspace root directory
uv workspace dir

11. Dependency Exclusions (0.9.8+)

Exclude packages from resolution:

# In pyproject.toml
[tool.uv]
dependency-exclusions = ["unwanted-package"]

# Or via CLI
uv sync --exclude unwanted-package

12. SBOM Export (0.9.11+)

Export Software Bill of Materials:

# Export dependencies as CycloneDX SBOM
uv export --format cyclonedx-json -o sbom.json

13. Package Building and Publishing

Build distributions:

# Build wheel and source distribution
uv build

# Build only wheel
uv build --wheel

# Build specific workspace package
uv build --package my-package

# Output to custom directory
uv build --out-dir dist/

Publish to PyPI:

# Publish directly with uv
uv publish

# Publish with token
uv publish --token $PYPI_TOKEN

# Publish to test PyPI
uv publish --publish-url https://test.pypi.org/legacy/

# Smoke test before publishing
uv run --isolated --no-project --with dist/*.whl python -c "import my_package"

PEP 740 attestations (0.9.12+): uv publish automatically collects and uploads attestations when available.

Build before publishing:

uv build --clear  # Remove old artifacts first (0.9.6+)
uv publish --build  # Build and publish in one step

Configuration

pyproject.toml Structure

Standard project configuration:

[project]
name = "myproject"
version = "1.0.0"
description = "My awesome project"
requires-python = ">=3.11"
dependencies = [
    "fastapi>=0.115.2",
    "pydantic>=2.5.3",
]

# Development dependencies using PEP 735 dependency groups
[dependency-groups]
dev = [
    "pytest>=8.4.2",
    "pytest-cov>=6.0.0",
    "pytest-mock>=3.15.1",
    "ruff>=0.13.3",
    "pyright>=1.1.406",
    "mypy>=1.18.2",
    "pre-commit>=4.3.0",
]
docs = ["sphinx>=7.0", "sphinx-rtd-theme>=1.3.0"]
test = ["pytest-cov>=6.0.0", "pytest-asyncio>=0.21.0"]

[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

[tool.uv]
# Core settings
managed = true
package = true
default-groups = ["dev"]

# Resolution
resolution = "highest"  # or "lowest", "lowest-direct"
index-strategy = "first-index"

# Build configuration
compile-bytecode = true
no-build-isolation-package = ["flash-attn"]

# Dependency exclusions (0.9.8+)
dependency-exclusions = ["unwanted-package"]

# PyTorch accelerator backend (0.9.18+ in config)
torch-backend = "auto"  # or "cu121", "rocm7.0", "cpu"

# Python management
python-preference = "managed"
python-downloads = "automatic"

# Custom package sources
[tool.uv.sources]
torch = { index = "pytorch-cu121" }
internal-lib = { workspace = true }

# Custom indexes
[[tool.uv.index]]
name = "pytorch-cu121"
url = "https://download.pytorch.org/whl/cu121"
explicit = true

Environment Variables

Key environment variables:

# Cache and directories
export UV_CACHE_DIR="/custom/cache"
export UV_PROJECT_ENVIRONMENT=".venv"
export UV_WORKING_DIR="/path/to/project"  # Preferred over UV_WORKING_DIRECTORY (0.9.14+)

# Python management
export UV_PYTHON_PREFERENCE="managed"
export UV_PYTHON_DOWNLOADS="automatic"

# Network configuration
export UV_CONCURRENT_DOWNLOADS=20
export UV_CONCURRENT_BUILDS=8

# Index authentication
export UV_INDEX_PRIVATE_USERNAME="user"
export UV_INDEX_PRIVATE_PASSWORD="pass"

# Preview features
export UV_PREVIEW=1

# Disable cache
export UV_NO_CACHE=1

# System Python
export UV_SYSTEM_PYTHON=1

# Dependency group control (0.9.8+)
export UV_NO_GROUP="docs"
export UV_NO_SOURCES=1
export UV_NO_DEFAULT_GROUPS=1

# Virtual environment (0.10.0+)
export UV_VENV_CLEAR=1  # Auto-remove existing venvs

# Build output control (0.9.15+)
export UV_HIDE_BUILD_OUTPUT=1

# Git LFS (0.9.15+)
export UV_GIT_LFS=1

# PyTorch accelerator backend
export UV_TORCH_BACKEND="cu121"  # or rocm7.0, rocm7.1, cpu, auto

# SSL certificate directory (0.9.10+)
export SSL_CERT_DIR="/path/to/certs"

For complete configuration reference, see references/configuration.md.

Common Workflows

Starting a New Project

# 1. Initialize project
uv init myproject
cd myproject

# 2. Add dependencies
uv add fastapi uvicorn sqlalchemy

# 3. Add dev dependencies
uv add --dev pytest ruff mypy

# 4. Run application
uv run python main.py

# 5. Run tests
uv run pytest

Creating a Portable Script

# 1. Create script with metadata
uv init --script analyze.py --python 3.11

# 2. Add dependencies
uv add --script analyze.py pandas matplotlib

# 3. Edit script content
# (add your code to analyze.py)

# 4. Lock for reproducibility
uv lock --script analyze.py

# 5. Make executable
chmod +x analyze.py

# 6. Run
./analyze.py

Migrating from pip/requirements.txt

uv init --bare
uv add -r requirements.txt
uv add --dev -r requirements-dev.txt
uv sync

For full workflow including hybrid approach and common issues, see references/migration-guide.md.

Migrating from Poetry

# Option 1: Automated (recommended)
uvx migrate-to-uv
uvx migrate-to-uv --dry-run  # Preview first

# Option 2: Manual
# poetry export -f requirements.txt --output requirements.txt
# uv init && uv add -r requirements.txt

For command mapping table and pyproject.toml conversion, see references/migration-guide.md.

CI/CD Integration (GitHub Actions)

Basic CI workflow:

name: CI
on: [push, pull_request]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install uv
        uses: astral-sh/setup-uv@v6
        with:
          enable-cache: true

      - name: Set up Python
        run: uv python install 3.11

      - name: Install dependencies
        run: uv sync --frozen --all-extras

      - name: Run tests
        run: uv run pytest

      - name: Run linters
        run: |
          uv run ruff check .
          uv run mypy .

Publishing workflow with trusted publishing:

name: Publish
on:
  push:
    tags:
      - v*

jobs:
  publish:
    runs-on: ubuntu-latest
    environment:
      name: pypi
    permissions:
      id-token: write
      contents: read
    steps:
      - uses: actions/checkout@v5
      - uses: astral-sh/setup-uv@v6
      - run: uv python install 3.13
      - run: uv build
      - run: uv run --isolated --no-project --with dist/*.whl tests/smoke_test.py
      - run: uv publish # Uses trusted publishing

Docker Integration

Note (0.10.0): Debian Bookworm, Alpine 3.21, and Python 3.8 Docker images are no longer published. Use uv:trixie/uv:debian and uv:alpine3.22/uv:alpine instead.

FROM python:3.12-slim

# Install uv
COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv

WORKDIR /app

# Copy dependency files
COPY pyproject.toml uv.lock ./

# Install dependencies
RUN uv sync --frozen --no-dev

# Copy application
COPY . .

# Use virtual environment
ENV PATH="/app/.venv/bin:$PATH"

CMD ["python", "main.py"]

Git Hook Integration (pre-commit / prek)

Configure uv-managed tools in .pre-commit-config.yaml:

Note: Both pre-commit and prek use the same configuration file with identical syntax.

# .pre-commit-config.yaml
repos:
  - repo: local
    hooks:
      - id: custom-hook
        name: Run Custom Hook
        entry: uv run my-hook-script
        language: system
        stages: [commit]
        pass_filenames: false
        always_run: true

Benefits of uv run in git hooks:

• Uses project's locked dependencies automatically
• No separate hook environment needed
• Ensures consistency between development and git hook checks
• Works with both pre-commit (Python) and prek (Rust)

Troubleshooting

"Externally Managed" Error

Problem: error: The interpreter is externally managed

Solution: Use virtual environments instead of --system:

uv venv
source .venv/bin/activate
uv pip install package

Build Failures

Problem: Package fails to build from source

Common causes:

• Missing system dependencies (compilers, headers)
• Python version incompatibility
• Outdated package version

Solutions:

• Install system dependencies: apt-get install python3-dev build-essential
• Add version constraints: uv add "numpy>=1.20"
• Check error message for missing modules

Lockfile Out of Sync

Problem: Dependencies changed but lockfile not updated

Solutions:

uv lock           # Regenerate lockfile
uv sync --locked  # Error if out of sync (CI mode)
uv sync --frozen  # Don't update lockfile

Cache Issues

Problem: Stale cache causing problems

Solutions:

uv cache size           # Show cache disk usage (0.9.8+)
uv cache clean          # Clean entire cache
uv cache prune          # Remove unreachable entries
uv --no-cache <command> # Bypass cache temporarily

Common Pitfalls

1. Forgetting --clear when recreating venvs (0.10.0+):

# Since 0.10.0, uv venv refuses to overwrite
uv venv          # Errors if .venv already exists
uv venv --clear  # Required to remove and recreate

2. Forgetting to sync after adding dependencies:

uv add requests  # Adds to pyproject.toml and updates lockfile
uv sync          # Required to actually install the package

3. Incorrect workspace glob patterns:

• Wrong: members = ["packages/"] (missing asterisk)
• Correct: members = ["packages/*"]

4. Missing build-system for libraries:

Libraries and packages require a [build-system] section:

[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

5. Wrong file mode for TOML operations:

• Use text mode 'r' and 'w' with tomlkit
• Do not use binary mode 'rb' or 'wb'

6. Incorrect workspace source syntax:

• Wrong: { workspace = "true" } (string "true")
• Correct: { workspace = true } (boolean true)

7. Not using --frozen in CI:

# CI should fail if lockfile is outdated
uv sync --frozen

8. Incompatible Python version ranges in workspaces:

All workspace members must have compatible requires-python ranges. If one member requires >=3.11 and another requires >=3.12, the workspace will use >=3.12.

For more troubleshooting scenarios, see references/troubleshooting.md.

Resources

This skill includes comprehensive reference documentation:

references/

• cli_reference.md - Complete CLI commands and arguments reference
• configuration.md - All configuration options and environment variables
• migration-guide.md - Step-by-step migration from pip, poetry, pipx, pyenv, conda — command mapping tables and common issues
• quick-reference.md - Command quick reference organized by subcommand with flags
• workflows.md - Detailed workflow guides and examples
• troubleshooting.md - Common issues and solutions

assets/

• pyproject_templates/ - Example pyproject.toml configurations
• script_examples/ - PEP 723 script templates
• docker_examples/ - Docker configuration templates
• github_actions/ - CI/CD workflow examples

Key Principles

1. Speed: uv is 10-100x faster than traditional tools
2. Reproducibility: Lockfiles ensure consistent environments
3. Simplicity: Single tool replaces multiple Python tools
4. Modern Standards: PEP 723 scripts, standard pyproject.toml
5. Developer Experience: Automatic Python installation, smart defaults

Usage Guidelines

Do

• Use uv run instead of activating venv — it auto-syncs and is faster
• Commit uv.lock — it ensures reproducible builds across machines and CI
• Use --locked in CI/CD — fails fast if lockfile is out of sync
• Use --dev flag for test/lint/type-check dependencies
• Use uvx for one-off tool usage — no permanent installation needed
• Use uv add not uv pip install for project dependencies — it updates pyproject.toml

Don't

• Don't activate venv manually (source .venv/bin/activate) — use uv run
• Don't use pip install alongside uv add in the same project — they don't share state
• Don't skip committing uv.lock — without it, CI and teammates get different versions
• Don't use uv pip install for project deps — it bypasses pyproject.toml and lockfile
• Don't use uv run without --frozen or --locked in CI — let it fail explicitly if stale

Version Information

Current latest version: 0.10.2 (February 2026)

0.10.0 Breaking Changes (February 2026)

• uv venv no longer auto-removes existing environments -- pass --clear or set UV_VENV_CLEAR=1
• Multiple default = true indexes now error (previously silently accepted)
• Unnamed explicit indexes now error (must have a name for [tool.uv.sources] references)
• Alternative Python implementations (PyPy, GraalPy, Pyodide) install under their implementation name (e.g., pypy3.10 not python3.10)
• uv tool run and uv tool install respect the global Python version pin
• Docker: Debian Bookworm, Alpine 3.21, and Python 3.8 images removed; use uv:trixie/uv:debian and uv:alpine3.22/uv:alpine
• uv format upgraded to Ruff 0.15.0 (2026 style guide); pin with uv format --version 0.14.14 to opt out
• exclude-newer lockfile changes no longer cause full version upgrades; use --upgrade explicitly

Features Stabilized in 0.10.0

• uv python upgrade / uv python install --upgrade
• uv workspace list / uv workspace dir
• uv add --bounds and add-bounds configuration
• extra-build-dependencies configuration

Key Features Added Since 0.9.5

• uv cache size command (0.9.8)
• First-class dependency exclusions via tool.uv.dependency-exclusions (0.9.8)
• Free-threaded Python +gil suffix for interpreter requests (0.9.8)
• SBOM export format in uv export (0.9.11)
• PEP 740 attestation auto-collection in uv publish (0.9.12)
• Git LFS support via UV_GIT_LFS (0.9.15)
• Relative durations for exclude-newer (e.g., "2 days ago", "1w") (0.9.17)
• --torch-backend in [tool.uv] configuration (0.9.18)
• ROCm 6.4, 7.0, 7.1 accelerator backend support (0.9.15, 0.9.27)
• Pyodide interpreter support on Windows (0.9.28)
• --compile-bytecode for uv python install/upgrade (0.9.25)
• uv pip freeze --exclude (0.9.27)
• Comma-separated values for --extra, --no-binary, --only-binary (0.9.30, 0.9.20)
• uv build --clear to remove old build artifacts (0.9.6)
• 5-minute default timeout on file locks (0.9.16)
• Proxy variables configurable via global/user config files (0.9.23)

Python Versions Added Since 0.9.5

• CPython 3.15.0a2 through 3.15.0a5
• CPython 3.14.1, 3.14.2, 3.14.3
• CPython 3.13.10, 3.13.11, 3.13.12
• Pyodide 0.29.2, 0.29.3
• GraalPy 25.0.1, 25.0.2

Deprecations

• --project flag in uv init deprecated; use positional argument or --name (0.9.9)
• UV_WORKING_DIRECTORY superseded by UV_WORKING_DIR (0.9.14)

External Resources

• Official docs: https://docs.astral.sh/uv/
• GitHub: https://github.com/astral-sh/uv
• Concepts guide: https://docs.astral.sh/uv/concepts/
• Migration guides: https://docs.astral.sh/uv/guides/migration/