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<h1 class="title">PyPy</h1>
<p>PyPy is a <a class="reference external" href="compat.html">very compliant</a> implementation of the <a class="reference external" href="http://python.org/">Python</a> language.
PyPy has several advantages and distinctive features:</p>
<blockquote>
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<li><strong>Speed:</strong> thanks to its Just-in-Time compiler, Python programs
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often run <a class="reference external" href="http://speed.pypy.org/comparison/?exe=2%2B35,1%2B172&amp;ben=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20&amp;env=1&amp;hor=false&amp;bas=2%2B35&amp;chart=normal+bars">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>
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<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 can be configured to run in <a class="reference external" href="http://www.stackless.com/">stackless</a> mode,
providing micro-threads for massive concurrency.</li>
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<li>As well as other <a class="reference external" href="features.html">features</a>.</li>
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<p class="download"><a class="reference external" href="download.html">Download and try out the PyPy release 1.4.1!</a></p>
<p>To read more about Python, look into <a class="reference external" href="http://www.python.org/doc/2.5.4/">Python docs</a> and check our
<a class="reference external" href="compat.html">Compatibility</a> page.  PyPy can run such python libraries as <a class="reference external" href="http://twistedmatrix.com/">twisted</a>
and <a class="reference external" href="http://www.djangoproject.com/">django</a> and supports <a class="reference external" href="http://www.python.org/doc/2.5.4/lib/module-ctypes.html">ctypes</a>.</p>
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