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  <section id="api-and-abi-versioning">
<span id="apiabiversion"></span><h1>API and ABI Versioning<a class="headerlink" href="#api-and-abi-versioning" title="Permalink to this headline">¶</a></h1>
<p>CPython exposes its version number in the following macros.
Note that these correspond to the version code is <strong>built</strong> with,
not necessarily the version used at <strong>run time</strong>.</p>
<p>See <a class="reference internal" href="stable.html#stable"><span class="std std-ref">C API Stability</span></a> for a discussion of API and ABI stability across versions.</p>
<dl class="c macro">
<dt class="sig sig-object c" id="c.PY_MAJOR_VERSION">
<span class="sig-name descname"><span class="n"><span class="pre">PY_MAJOR_VERSION</span></span></span><a class="headerlink" href="#c.PY_MAJOR_VERSION" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>The <code class="docutils literal notranslate"><span class="pre">3</span></code> in <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>.</p>
</dd></dl>

<dl class="c macro">
<dt class="sig sig-object c" id="c.PY_MINOR_VERSION">
<span class="sig-name descname"><span class="n"><span class="pre">PY_MINOR_VERSION</span></span></span><a class="headerlink" href="#c.PY_MINOR_VERSION" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>The <code class="docutils literal notranslate"><span class="pre">4</span></code> in <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>.</p>
</dd></dl>

<dl class="c macro">
<dt class="sig sig-object c" id="c.PY_MICRO_VERSION">
<span class="sig-name descname"><span class="n"><span class="pre">PY_MICRO_VERSION</span></span></span><a class="headerlink" href="#c.PY_MICRO_VERSION" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>The <code class="docutils literal notranslate"><span class="pre">1</span></code> in <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>.</p>
</dd></dl>

<dl class="c macro">
<dt class="sig sig-object c" id="c.PY_RELEASE_LEVEL">
<span class="sig-name descname"><span class="n"><span class="pre">PY_RELEASE_LEVEL</span></span></span><a class="headerlink" href="#c.PY_RELEASE_LEVEL" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>The <code class="docutils literal notranslate"><span class="pre">a</span></code> in <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>.
This can be <code class="docutils literal notranslate"><span class="pre">0xA</span></code> for alpha, <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
candidate or <code class="docutils literal notranslate"><span class="pre">0xF</span></code> for final.</p>
</dd></dl>

<dl class="c macro">
<dt class="sig sig-object c" id="c.PY_RELEASE_SERIAL">
<span class="sig-name descname"><span class="n"><span class="pre">PY_RELEASE_SERIAL</span></span></span><a class="headerlink" href="#c.PY_RELEASE_SERIAL" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>The <code class="docutils literal notranslate"><span class="pre">2</span></code> in <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code>. Zero for final releases.</p>
</dd></dl>

<dl class="c macro">
<dt class="sig sig-object c" id="c.PY_VERSION_HEX">
<span class="sig-name descname"><span class="n"><span class="pre">PY_VERSION_HEX</span></span></span><a class="headerlink" href="#c.PY_VERSION_HEX" title="Permalink to this definition">¶</a><br /></dt>
<dd><p>The Python version number encoded in a single integer.</p>
<p>The underlying version information can be found by treating it as a 32 bit
number in the following manner:</p>
<table class="docutils align-default">
<colgroup>
<col style="width: 8%" />
<col style="width: 30%" />
<col style="width: 30%" />
<col style="width: 31%" />
</colgroup>
<thead>
<tr class="row-odd"><th class="head"><p>Bytes</p></th>
<th class="head"><p>Bits (big endian order)</p></th>
<th class="head"><p>Meaning</p></th>
<th class="head"><p>Value for <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code></p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>1</p></td>
<td><p>1-8</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">PY_MAJOR_VERSION</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x03</span></code></p></td>
</tr>
<tr class="row-odd"><td><p>2</p></td>
<td><p>9-16</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">PY_MINOR_VERSION</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x04</span></code></p></td>
</tr>
<tr class="row-even"><td><p>3</p></td>
<td><p>17-24</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">PY_MICRO_VERSION</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x01</span></code></p></td>
</tr>
<tr class="row-odd"><td rowspan="2"><p>4</p></td>
<td><p>25-28</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">PY_RELEASE_LEVEL</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0xA</span></code></p></td>
</tr>
<tr class="row-even"><td><p>29-32</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">PY_RELEASE_SERIAL</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x2</span></code></p></td>
</tr>
</tbody>
</table>
<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> and <code class="docutils literal notranslate"><span class="pre">3.10.0</span></code> is
hexversion <code class="docutils literal notranslate"><span class="pre">0x030a00f0</span></code>.</p>
</dd></dl>

<p>All the given macros are defined in <a class="reference external" href="https://github.com/python/cpython/tree/3.10/Include/patchlevel.h">Include/patchlevel.h</a>.</p>
</section>

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