<!DOCTYPE html> <html> <head> <title>PyPy - Welcome to PyPy</title> <meta http-equiv="content-language" content="en" /> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <meta name="author" content="PyPy Team" /> <meta name="description" content="PyPy" /> <meta name="copyright" content="MIT" /> <meta name="document-rating" content="general" /> <link rel="stylesheet" type="text/css" media="screen" title="default" href="css/site.css" /> <link rel="alternate" type="application/rss+xml" title="RSS Feed for PyPy" href="http://feeds.feedburner.com/PyPyStatusBlog" /> <link rel="stylesheet" type="text/css" href="css/jquery-ui-1.8.14.custom.css" /> <script type="text/javascript" src="https://use.typekit.com/hdt8sni.js"></script> <script type="text/javascript">try{Typekit.load();}catch(e){}</script> <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript" src="js/jquery-ui-1.8.14.custom.min.js"></script> <script type="text/javascript" src="js/script2.js?bust=1"></script> </head> <body> <script type="text/javascript"> var _gaq = [['_setAccount', 'UA-7778406-3'], ['_trackPageview']]; if (document.location.protocol !== 'file:') { (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(ga); })(); } </script> <div id="body-outer"><div id="body-inner"><div id="body" class="clearfix"> <div id="header"> <div id="menu-follow"> <div><a href="https://bitbucket.org/pypy/pypy"><img src="https://www.selenic.com/hg-logo/logo-droplets-25.png" width="14px" height="14px" /></a></div> <div><a href="http://feeds.feedburner.com/PyPyStatusBlog" title="Subscribe to the RSS Feed"><img src="https://feedburner.google.com/fb/lib/images/icons/feed-icon-12x12-orange.gif" alt="Subscribe to the RSS Feed" width="14px" height="14px" /></a></div> </div> <div id="logo"><a href="http://pypy.org"><img src="image/pypy-logo.png" alt="PyPy" height="110px" /></a></div> <hr class="clear-left" /> <div id="menu-sub"> <a href="index.html">Home</a> <span class="menu-sub-sep"> | </span> <a href="features.html">What is PyPy?</a> <span class="menu-sub-sep"> | </span> <a href="download.html">Download</a> <span class="menu-sub-sep"> | </span> <a href="compat.html">Compatibility</a> <span class="menu-sub-sep"> | </span> <a href="performance.html">Performance</a> <span class="menu-sub-sep"> | </span> <a href="http://doc.pypy.org">Dev Documentation</a> <span class="menu-sub-sep"> | </span> <a href="http://morepypy.blogspot.com">Blog</a> <span class="menu-sub-sep"> | </span> <a href="people.html">People</a> <span class="menu-sub-sep"> | </span> <a href="contact.html">Contact</a> <br /> </div> <hr class="clear" /> </div> <div id="content"> <div> <div id="main"> <h1 class="title">Welcome to PyPy</h1> <p>PyPy is a <a class="reference external" href="http://speed.pypy.org/">fast</a>, <a class="reference external" href="compat.html">compliant</a> alternative implementation of the <a class="reference external" href="http://python.org/">Python</a> language (2.7.13 and 3.6.9). It has several advantages and distinct features:</p> <blockquote> <ul> <li><p class="first"><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> <p>“If you want your code to run faster, you should probably just use PyPy.” — Guido van Rossum (creator of Python)</p> </li> <li><p class="first"><strong>Memory usage:</strong> memory-hungry Python programs (several hundreds of MBs or more) might end up taking <a class="reference external" href="http://morepypy.blogspot.com/2009/10/gc-improvements.html">less space</a> than they do in CPython.</p> </li> <li><p class="first"><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> 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>.</p> </li> <li><p class="first"><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 class="first">As well as other <a class="reference external" href="features.html">features</a>.</p> </li> </ul> </blockquote> <p class="download"><a class="reference external" href="download.html">Download and try out PyPy</a></p> <p>Want to know more? A good place to start is our detailed <a class="reference external" href="http://speed.pypy.org/">speed</a> and <a class="reference external" href="compat.html">compatibility</a> reports!</p> </div> <div id="sidebar"> </div> </div> </div> </div></div></div> </body> </html>