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<div class="section" id="api-and-abi-versioning">
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<span id="apiabiversion"></span><h1>API and ABI Versioning<a class="headerlink" href="#api-and-abi-versioning" title="Permalink to this headline">¶</a></h1>
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<p><code class="docutils literal notranslate"><span class="pre">PY_VERSION_HEX</span></code> is the Python version number encoded in a single integer.</p>
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<p>For example if the <code class="docutils literal notranslate"><span class="pre">PY_VERSION_HEX</span></code> is set to <code class="docutils literal notranslate"><span class="pre">0x030401a2</span></code>, the underlying
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version information can be found by treating it as a 32 bit number in
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the following manner:</p>
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<blockquote>
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<div><table class="docutils align-center">
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<col style="width: 31%" />
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<col style="width: 60%" />
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</colgroup>
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<thead>
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<tr class="row-odd"><th class="head"><p>Bytes</p></th>
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<th class="head"><p>Bits (big endian order)</p></th>
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<th class="head"><p>Meaning</p></th>
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</tr>
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</thead>
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<tbody>
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<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">1</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">1-8</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">PY_MAJOR_VERSION</span></code> (the <code class="docutils literal notranslate"><span class="pre">3</span></code> in
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<code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>)</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">2</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">9-16</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">PY_MINOR_VERSION</span></code> (the <code class="docutils literal notranslate"><span class="pre">4</span></code> in
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<code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>)</p></td>
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</tr>
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<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">3</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">17-24</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">PY_MICRO_VERSION</span></code> (the <code class="docutils literal notranslate"><span class="pre">1</span></code> in
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<code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>)</p></td>
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</tr>
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<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">4</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">25-28</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">PY_RELEASE_LEVEL</span></code> (<code class="docutils literal notranslate"><span class="pre">0xA</span></code> for alpha,
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<code class="docutils literal notranslate"><span class="pre">0xB</span></code> for beta, <code class="docutils literal notranslate"><span class="pre">0xC</span></code> for release
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candidate and <code class="docutils literal notranslate"><span class="pre">0xF</span></code> for final), in this
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case it is alpha.</p></td>
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</tr>
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<tr class="row-even"><td></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">29-32</span></code></p></td>
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<td><p><code class="docutils literal notranslate"><span class="pre">PY_RELEASE_SERIAL</span></code> (the <code class="docutils literal notranslate"><span class="pre">2</span></code> in
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<code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>, zero for final releases)</p></td>
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</tr>
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</tbody>
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</table>
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</div></blockquote>
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<p>Thus <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code> is hexversion <code class="docutils literal notranslate"><span class="pre">0x030401a2</span></code>.</p>
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<p>All the given macros are defined in <a class="reference external" href="https://github.com/python/cpython/tree/3.7/Include/patchlevel.h">Include/patchlevel.h</a>.</p>
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