PyPy

<!DOCTYPE html> <html prefix=" og: http://ogp.me/ns# article: http://ogp.me/ns/article# " vocab="http://ogp.me/ns" lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>PyPy</title> <link href="assets/css/rst_base.css" rel="stylesheet" type="text/css"> <link href="assets/css/nikola_rst.css" rel="stylesheet" type="text/css"> <link href="assets/css/code.css" rel="stylesheet" type="text/css"> <link href="assets/css/theme.css" rel="stylesheet" type="text/css"> <link href="assets/css/styles.css" rel="stylesheet" type="text/css"> <meta name="theme-color" content="#5670d4"> <meta name="generator" content="Nikola (getnikola.com)"> <link rel="alternate" type="application/rss+xml" title="RSS" hreflang="en" href="rss.xml"> <link rel="canonical" href="https://www.pypy.org/"> <link rel="icon" href="favicon2.ico" sizes="16x16"> <link rel="icon" href="favicon32x32.ico" sizes="32x32"> <link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet"> <link rel="stylesheet" type="text/css" href="assets/css/tipuesearch.css"> <meta name="author" content="The PyPy Team"> <meta property="og:site_name" content="PyPy"> <meta property="og:title" content="PyPy"> <meta property="og:url" content="https://www.pypy.org/"> <meta property="og:description" content="A fast, compliant alternative implementation of Python Download PyPy What is PyPy ? Documentation (external link) On average, PyPy is about 3 times faster than CPython 3.11. We currently "> <meta property="og:type" content="article"> <meta property="article:published_time" content="2019-12-28T16:14:02Z"> </head> <body> <a href="#content" class="sr-only sr-only-focusable">Skip to main content</a> <div id="container"> <header id="header"><section class="navigation"><div class="nav-container"> <div class="brand"> <a href="#"> <image id="toplogo" src="images/pypy-logo.svg" width="75px;" alt="PyPy/"></image></a> </div> <nav><ul class="nav-list"> <li> <a href="#!">Features</a> <ul class="nav-dropdown"> <li> <a href="features.html">What is PyPy?</a> </li> <li> <a href="compat.html">Compatibility</a> </li> <li> <a href="performance.html">Performance</a> </li> </ul> </li> <li> <a href="download.html">Download</a> </li> <li> <a href="http://doc.pypy.org">Dev Docs</a> </li> <li> <a href="#!">Blog</a> <ul class="nav-dropdown"> <li> <a href="blog/">Index</a> </li> <li> <a href="categories/">Tags</a> </li> <li> <a href="archive.html">Archive by year</a> </li> <li> <a href="rss.xml">RSS feed</a> </li> <li> <a href="https://morepypy.blogspot.com/">Old site</a> </li> </ul> </li> <li> <a href="#!">About</a> <ul class="nav-dropdown"> <li> <a href="https://bsky.app/profile/pypyproject.bsky.social">Bluesky</a> </li> <li> <a href="https://libera.irclog.whitequark.org/pypy">IRC logs</a> </li> <li> <a href="https://www.youtube.com/playlist?list=PLADqad94yVqDRQXuqxKrPS5QnVqbDLlRt">YouTube</a> </li> <li> <a href="https://www.twitch.tv/pypyproject">Twitch</a> </li> <li> <a href="pypy-sponsors.html">Sponsors</a> </li> <li> <a href="howtohelp.html">How To Help?</a> </li> <li> <a href="contact.html">Contact</a> </li> </ul> </li> </ul></nav><div class="nav-mobile"> <a id="nav-toggle" href="#!"> <span></span></a> </div> </div> </section><div class="searchform" role="search"> <form class="navbar-form navbar-left" action="search.html" role="search"> <div class="form-group"> <input type="text" class="form-control" id="tipue_search_input" name="q" placeholder="Search…" autocomplete="off"> </div> <input type="submit" value="Local Search" style="visibility: hidden;"> </form> </div> </header><main id="content"><article class="post-text storypage" itemscope="itemscope" itemtype="http://schema.org/Article"><header><h1 class="p-name entry-title" itemprop="headline name"><a href="." class="u-url">PyPy</a></h1> </header><div class="e-content entry-content" itemprop="articleBody text"> <div class="row"> <div class="column pb-4"> <p>A <a class="reference external" href="http://speed.pypy.org/">fast</a>, <a class="reference external" href="compat.html">compliant</a> alternative implementation of <a class="reference external" href="http://python.org/">Python</a></p> <a id="download" href="download.html"> <img src="images/download.svg"> Download PyPy </a><p class="button"><a class="reference external" href="features.html">What is PyPy</a> ?</p> <p class="button"><a class="reference external" href="https://doc.pypy.org">Documentation</a> (external link)</p> </div> <div class="column pb-4"><img alt="PyPy logo" src="images/pypy-logo.svg" style="width: 300px;"></div> </div> <p class="small">On average, PyPy is <strong>about 3 times faster</strong> than CPython 3.11. We currently support python 3.11 and 2.7.</p> <figure class="text-sm"><img alt='PyPy vs. Python speed comparison graph"' src="images/pypy_speed_graph.png" style="width: 100%;"><figcaption><p>PyPy (with JIT) benchmark times normalized to CPython. Smaller is better. Based on the geometric average of all benchmarks</p> </figcaption></figure><pre class="literal-block">"... we are avid fans of PyPy and commensurately thankful for the great work by the PyPy team over the years. PyPy has enabled us to use Python for a larger part of our toolset than CPython alone would have supported, and its smooth integration with C/C++ through CFFI has helped us attain a better tradeoff between performance and programmer productivity in our projects" -- Vilhjálmur Þorsteinsson, founder and CEO of Miðeind, Feb 2022</pre> <p><strong>Advantages and distinct Features</strong></p> <ul class="simple"> <li><p><strong>Speed:</strong> thanks to its Just-in-Time compiler, Python programs often run <a class="reference external" href="http://speed.pypy.org/">faster</a> on PyPy. <a class="reference external" href="http://en.wikipedia.org/wiki/Just-in-time_compilation">(What is a JIT compiler?)</a></p></li> <li><p><strong>Memory usage:</strong> memory-hungry Python programs (several hundreds of MBs or more) might end up taking <a class="reference external" href="posts/2009/10/gc-improvements-6174120095428192954.html">less space</a> than they do in CPython.</p></li> <li><p><strong>Compatibility:</strong> PyPy is <a class="reference external" href="compat.html">highly compatible</a> with existing python code. It supports <a class="reference external" href="https://cffi.readthedocs.org">cffi</a>, <a class="reference external" href="https://cppyy.readthedocs.org">cppyy</a>, and can run popular python libraries like <a class="reference external" href="https://twistedmatrix.com/">twisted</a>, and <a class="reference external" href="https://www.djangoproject.com/">django</a>. It can also run NumPy, Scikit-learn and more via a c-extension compatibility layer.</p></li> <li><p><strong>Stackless:</strong> PyPy comes by default with support for <a class="reference external" href="features.html#stackless">stackless mode</a>, providing micro-threads for massive concurrency.</p></li> <li><p>As well as other <a class="reference external" href="features.html">features</a>.</p></li> </ul> </div> </article></main><footer id="footer"><p> </p> <div class="myfooter"> <div class="logotext"> © 2025 <a href="mailto:pypy-dev@pypy.org">The PyPy Team</a> Built with <a href="https://getnikola.com" rel="nofollow">Nikola</a> Last built 2025-02-26T12:28 </div> <div style="margin-left: auto"> <a href="rss.xml">RSS feed</a> </div> </div> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js" crossorigin="anonymous"></script><script src="assets/js/styles.js"></script></footer> </div> </body> </html>

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