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<h1 class="title">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 (2.7.2). It has several advantages and distinct features:</p>
<blockquote>
<ul class="simple">
<li><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></li>
<li><strong>Memory usage:</strong> large, memory-hungry Python programs 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.</li>
<li><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="http://docs.python.org/release/2.7.2/library/ctypes.html">ctypes</a> and can run popular python libraries like <a class="reference external" href="http://twistedmatrix.com/">twisted</a>
and <a class="reference external" href="http://www.djangoproject.com/">django</a>.</li>
<li><strong>Sandboxing:</strong> PyPy provides the ability to <a class="reference external" href="features.html#sandboxing">run untrusted code</a> in a
fully secure way.</li>
<li><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.</li>
<li>As well as other <a class="reference external" href="features.html">features</a>.</li>
</ul>
</blockquote>
<p class="download"><a class="reference external" href="download.html">Download and try out the PyPy release 1.9!</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>
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