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  <section id="porting-extension-modules-to-python-3">
<span id="cporting-howto"></span><h1>Porting Extension Modules to Python 3<a class="headerlink" href="#porting-extension-modules-to-python-3" title="Link to this heading">¶</a></h1>
<p>We recommend the following resources for porting extension modules to Python 3:</p>
<ul class="simple">
<li><p>The <a class="reference external" href="http://python3porting.com/cextensions.html">Migrating C extensions</a> chapter from
<em>Supporting Python 3: An in-depth guide</em>, a book on moving from Python 2
to Python 3 in general, guides the reader through porting an extension
module.</p></li>
<li><p>The <a class="reference external" href="https://py3c.readthedocs.io/en/latest/guide.html">Porting guide</a> from the <em>py3c</em> project provides opinionated
suggestions with supporting code.</p></li>
<li><p>The <a class="reference external" href="https://cython.org/">Cython</a> and <a class="reference external" href="https://cffi.readthedocs.io/en/latest/">CFFI</a> libraries offer abstractions over
Python’s C API.
Extensions generally need to be re-written to use one of them,
but the library then handles differences between various Python
versions and implementations.</p></li>
</ul>
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