<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>API and ABI Versioning — Python v3.3.2 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '3.3.2', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within 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class="docutils literal"><span class="pre">PY_VERSION_HEX</span></tt> is set to <tt class="docutils literal"><span class="pre">0x030401a2</span></tt>, the underlying version information can be found by treating it as a 32 bit number in the following manner:</p> <blockquote> <div><table border="1" class="docutils"> <colgroup> <col width="9%" /> <col width="31%" /> <col width="60%" /> </colgroup> <thead valign="bottom"> <tr><th class="head">Bytes</th> <th class="head">Bits (big endian order)</th> <th class="head">Meaning</th> </tr> </thead> <tbody valign="top"> <tr><td><tt class="docutils literal"><span class="pre">1</span></tt></td> <td><tt class="docutils literal"><span class="pre">1-8</span></tt></td> <td><tt class="docutils literal"><span class="pre">PY_MAJOR_VERSION</span></tt> (the <tt class="docutils literal"><span class="pre">3</span></tt> in <tt class="docutils literal"><span class="pre">3.4.1a2</span></tt>)</td> </tr> <tr><td><tt class="docutils literal"><span class="pre">2</span></tt></td> <td><tt class="docutils literal"><span class="pre">9-16</span></tt></td> <td><tt class="docutils literal"><span class="pre">PY_MINOR_VERSION</span></tt> (the <tt class="docutils literal"><span class="pre">4</span></tt> in <tt class="docutils literal"><span class="pre">3.4.1a2</span></tt>)</td> </tr> <tr><td><tt class="docutils literal"><span class="pre">3</span></tt></td> <td><tt class="docutils literal"><span class="pre">17-24</span></tt></td> <td><tt class="docutils literal"><span class="pre">PY_MICRO_VERSION</span></tt> (the <tt class="docutils literal"><span class="pre">1</span></tt> in <tt class="docutils literal"><span class="pre">3.4.1a2</span></tt>)</td> </tr> <tr><td><tt class="docutils literal"><span class="pre">4</span></tt></td> <td><tt class="docutils literal"><span class="pre">25-28</span></tt></td> <td><tt class="docutils literal"><span class="pre">PY_RELEASE_LEVEL</span></tt> (<tt class="docutils literal"><span class="pre">0xA</span></tt> for alpha, <tt class="docutils literal"><span class="pre">0xB</span></tt> for beta, <tt class="docutils literal"><span class="pre">0xC</span></tt> for release candidate and <tt class="docutils literal"><span class="pre">0xF</span></tt> for final), in this case it is alpha.</td> </tr> <tr><td> </td> <td><tt class="docutils literal"><span class="pre">29-32</span></tt></td> <td><tt class="docutils literal"><span class="pre">PY_RELEASE_SERIAL</span></tt> (the <tt class="docutils literal"><span class="pre">2</span></tt> in <tt class="docutils literal"><span class="pre">3.4.1a2</span></tt>, zero for final releases)</td> </tr> </tbody> </table> </div></blockquote> <p>Thus <tt class="docutils literal"><span class="pre">3.4.1a2</span></tt> is hexversion <tt class="docutils literal"><span class="pre">0x030401a2</span></tt>.</p> <p>All the given macros are defined in <a class="reference external" href="http://hg.python.org/cpython/file/3.3/Include/patchlevel.h">Include/patchlevel.h</a>.</p> 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