{"id":13631,"date":"2026-04-22T16:57:02","date_gmt":"2026-04-22T16:57:02","guid":{"rendered":"https:\/\/cheesecakelabs.com\/blog\/"},"modified":"2026-04-22T17:03:10","modified_gmt":"2026-04-22T17:03:10","slug":"uv-a-modern-high-performance-python-package-manager","status":"publish","type":"post","link":"https:\/\/cheesecakelabs.com\/blog\/uv-a-modern-high-performance-python-package-manager\/","title":{"rendered":"uv: A Modern, High-Performance Python Package Manager"},"content":{"rendered":"\n<p>Package management in Python has long been dominated by tools like <strong>pip<\/strong> and <strong>virtualenv<\/strong>, often supported by auxiliary utilities for dependency locking and environment management. With growing project complexity and demands for faster <a href=\"https:\/\/cheesecakelabs.com\/blog\/deploying-fastapi-on-aws-app-runner\/\" target=\"_blank\" rel=\"noreferrer noopener\">CI\/CD workflows<\/a>, the Python ecosystem is evolving.<\/p>\n\n\n\n<p>One of the newest entrants is <a href=\"https:\/\/docs.astral.sh\/uv\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>uv<\/strong><\/a>, a Rust-based, all-in-one package and project manager designed for speed and unification of traditional tools.<\/p>\n\n\n\n<p>This article explains what <strong>UV<\/strong> is, how it differs from and improves on <strong>pip<\/strong>, and provides a step-by-step guide to adopting it in real Python projects. You\u2019ll also find a sample pyproject.toml with commentary on dev dependencies for common workflows like testing and quality checks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why UV exists<\/strong><\/h2>\n\n\n\n<p>Python tooling historically has used a mix of utilities:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pip for installing packages<\/li>\n\n\n\n<li>virtualenv \/ venv for isolated environments<\/li>\n\n\n\n<li>pip-tools for compile\/sync workflows<\/li>\n\n\n\n<li>pipx for global CLI tool installation<\/li>\n\n\n\n<li>pyenv or similar for Python version management<\/li>\n<\/ul>\n\n\n\n<p>Each utility addresses a subset of project setup and dependency management, but also introduces friction in configuration and performance. <strong>UV<\/strong> aims to unify these responsibilities under a single interface, with performance and usability improvements out of the box.<\/p>\n\n\n\n<p>At its core, <strong>UV<\/strong> is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>drop-in replacement for pip<\/strong> (fully compatible with PyPI and requirements.txt)<\/li>\n\n\n\n<li>A <strong>virtual environment manager<\/strong><\/li>\n\n\n\n<li>A <strong>dependency resolver and lockfile generator<\/strong><\/li>\n\n\n\n<li>A <strong>project scaffolding tool<\/strong><\/li>\n\n\n\n<li>A <strong>Python version installer<\/strong> (optional)<br>&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>UV vs. pip: What\u2019s different<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1200\" height=\"603\" src=\"https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2026\/04\/Create-styled-table-uv-1200x603.png\" alt=\"UV vs. pip board comparation\" class=\"wp-image-13633\" srcset=\"https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2026\/04\/Create-styled-table-uv-1200x603.png 1200w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2026\/04\/Create-styled-table-uv-600x301.png 600w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2026\/04\/Create-styled-table-uv-768x386.png 768w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2026\/04\/Create-styled-table-uv-1536x771.png 1536w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2026\/04\/Create-styled-table-uv-760x382.png 760w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2026\/04\/Create-styled-table-uv.png 1583w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Performance<\/strong><\/h3>\n\n\n\n<p>Because uv is written in Rust and handles multiple downloads and resolutions in parallel while using a global cache, installation workflows are significantly faster than standard pip operations.<\/p>\n\n\n\n<p>Benchmarks report up to 10\u00d7 faster installations compared to pip even without cache, and up to 100\u00d7 faster when the global cache is warm, which is the most common scenario in day-to-day development, since dependencies rarely change between runs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Unified toolchain<\/strong><\/h3>\n\n\n\n<p>With UV, you don\u2019t need to coordinate multiple CLI tools for environment setup, dependencies, and Python version control. A single interface simplifies both local development and CI\/CD scripts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Lockfiles and reproducibility<\/strong><\/h3>\n\n\n\n<p>Unlike relying solely on a plain requirements.txt, uv produces a lockfile that records precise versions and metadata. This ensures consistent installs across machines and builds.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Installation and getting started<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Installing uv<\/strong><\/h3>\n\n\n\n<p>You can install <strong>UV<\/strong> using one of the following methods. Standalone installers are recommended for full functionality.<\/p>\n\n\n\n<p><strong>macOS \/ Linux:<\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Windows (PowerShell):<\/strong><\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">powershell -ExecutionPolicy ByPass -c <span class=\"hljs-string\">\"irm https:\/\/astral.sh\/uv\/install.ps1 | iex\"<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Alternatively, install via pip or pipx:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">pip install uv\n<span class=\"hljs-comment\"># or<\/span>\npipx install uv<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Once installed, confirm the version:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">uv --version<\/code><\/span><\/pre>\n\n\n<p>At this point, you can start using <strong>UV<\/strong> in your Python projects.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Step-by-step: Using UV in a Python project<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Initialize a project<\/strong><\/h3>\n\n\n\n<p>Create a new project and initialize it with uv. This sets up a directory with basic config:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">mkdir myproject &amp;&amp; cd myproject\nuv init<\/code><\/span><\/pre>\n\n\n<p>This creates:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pyproject.toml \u2013 project configuration<\/li>\n\n\n\n<li>Lockfile \u2013 dependency snapshot<\/li>\n\n\n\n<li>Virtual environment defaults<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Adding dependencies<\/strong><\/h3>\n\n\n\n<p>To install runtime dependencies:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">UV add requests Flask<\/code><\/span><\/pre>\n\n\n<p>For development dependencies (e.g., for testing):<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">uv add --dev pytest pytest-cov<\/code><\/span><\/pre>\n\n\n<p>uv separates dev dependencies under the dev section in pyproject.toml, similar to other modern package managers.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Syncing dependencies<\/strong><\/h3>\n\n\n\n<p>To install packages based on your lockfile:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">uv sync<\/code><\/span><\/pre>\n\n\n<p>This ensures reproducible installs every time, unlike ad-hoc installs with pip install.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Running code<\/strong><\/h3>\n\n\n\n<p>To run Python with the managed environment:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">uv<\/span> <span class=\"hljs-selector-tag\">run<\/span> <span class=\"hljs-selector-tag\">python<\/span> <span class=\"hljs-selector-tag\">main<\/span><span class=\"hljs-selector-class\">.py<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>You can also run tools directly:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">uv run pytest<\/code><\/span><\/pre>\n\n\n<h2 class=\"wp-block-heading\"><strong>Example <\/strong><strong>pyproject.toml<\/strong><\/h2>\n\n\n\n<p>Below is an annotated sample configuration:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">&#91;project]\nname = <span class=\"hljs-string\">\"myproject\"<\/span>\nversion = <span class=\"hljs-string\">\"0.1.0\"<\/span>\ndescription = <span class=\"hljs-string\">\"Example project using uv\"<\/span>\nauthors = &#91;<span class=\"hljs-string\">\"Your Name &lt;you@example.com&gt;\"<\/span>]\ndependencies = &#91;\n    <span class=\"hljs-string\">\"requests&gt;=2.28.0\"<\/span>,\n    <span class=\"hljs-string\">\"flask&gt;=2.2.0\"<\/span>,\n]\n\n&#91;dependency-groups]\ndev = &#91;\n    <span class=\"hljs-string\">\"pytest&gt;=7.0.0\"<\/span>,\n    <span class=\"hljs-string\">\"pytest-cov\"<\/span>,\n    <span class=\"hljs-string\">\"ruff\"<\/span>,\n    <span class=\"hljs-string\">\"black\"<\/span>,\n]\n\n&#91;tool.uv]\npython = <span class=\"hljs-string\">\"&gt;=3.10\"<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>[project]<\/strong>: Standard metadata used for packaging and project identity.<br><\/li>\n\n\n\n<li><strong>dependencies<\/strong>: Runtime packages installed via uv add \u2026.<br><\/li>\n\n\n\n<li><strong>optional-dependencies.dev<\/strong>: Development dependencies for testing and code quality (pytest, ruff, black). These are only installed in development contexts.<br><\/li>\n\n\n\n<li><strong>[tool.uv]<\/strong>: uv-specific configuration, such as Python version constraints and lockfile location.<br><\/li>\n<\/ul>\n\n\n\n<p>This structure ensures a clean separation between primary and dev dependencies while maintaining reproducibility via the lockfile.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Integrating testing and quality workflows<\/strong><\/h2>\n\n\n\n<p>Once dependencies are installed, you can integrate standard workflows:<\/p>\n\n\n\n<p>Linting:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">uv run ruff .<\/code><\/span><\/pre>\n\n\n<p>Formatting:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">uv run black .<\/code><\/span><\/pre>\n\n\n<p>Running tests:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">uv run pytest<\/code><\/span><\/pre>\n\n\n<p>These commands run within the uv-managed environment, eliminating the need for separate virtualenv activation steps.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>When to use UV vs. Pip<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Advantages of UV<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Performance<\/strong>: Faster installs and resolution.<br><\/li>\n\n\n\n<li><strong>Unified CLI<\/strong>: Replace multiple tools with one.<br><\/li>\n\n\n\n<li><strong>Reproducibility<\/strong>: Built-in lockfile guarantees consistent environments.<br><\/li>\n\n\n\n<li><strong>Project scoping<\/strong>: Easier development scripting and tooling integration.<br><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>When pip still makes sense<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Existing production systems<\/strong> that assume pip as part of the system Python.<br><\/li>\n\n\n\n<li><strong>Docker images<\/strong> where only pip is installed by default, and you need a minimal footprint.<br><\/li>\n\n\n\n<li><strong>Maximum compatibility<\/strong> with older Python workflows.<br><\/li>\n<\/ul>\n\n\n\n<p>In many modern development contexts, UV can streamline workflows without sacrificing compatibility with PyPI and requirements formats.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Summary<\/strong><\/h2>\n\n\n\n<p><strong>UV<\/strong> is an emerging Python package and project manager that unifies multiple tools into a single interface while delivering performance improvements and simplified workflows. It is both a <strong>drop-in replacement for pip workflows<\/strong> and a more capable project manager with lockfiles, environment control, and dev dependencies built in.<\/p>\n\n\n\n<p>By adopting UV, teams can reduce tooling complexity and speed up local development and CI\/CD pipelines. The integration with a <strong>pyproject.toml-centric<\/strong> workflow also aligns with modern Python packaging standards.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"http:\/\/cheesecakelabs.com\/services\/\"><img decoding=\"async\" width=\"1200\" height=\"409\" src=\"https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2023\/06\/legacy-app-ckl-1200x409.jpg\" alt=\"\" class=\"wp-image-13491\" srcset=\"https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2023\/06\/legacy-app-ckl-1200x409.jpg 1200w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2023\/06\/legacy-app-ckl-600x205.jpg 600w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2023\/06\/legacy-app-ckl-768x262.jpg 768w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2023\/06\/legacy-app-ckl-1536x524.jpg 1536w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2023\/06\/legacy-app-ckl-760x259.jpg 760w, https:\/\/ckl-website-static.s3.amazonaws.com\/wp-content\/uploads\/2023\/06\/legacy-app-ckl.jpg 1920w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Package management in Python has long been dominated by tools like pip and virtualenv, often supported by auxiliary utilities for dependency locking and environment management. With growing project complexity and demands for faster CI\/CD workflows, the Python ecosystem is evolving. One of the newest entrants is uv, a Rust-based, all-in-one package and project manager designed [&hellip;]<\/p>\n","protected":false},"author":92,"featured_media":13646,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[432],"tags":[],"class_list":["post-13631","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-engineering"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>uv: A Modern, High-Performance Python Package Manager<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cheesecakelabs.com\/blog\/uv-a-modern-high-performance-python-package-manager\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"uv: A Modern, High-Performance Python Package Manager\" \/>\n<meta property=\"og:description\" content=\"Package management in Python has long been dominated by tools like pip and virtualenv, often supported by auxiliary utilities for dependency locking and environment management. 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