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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="Link to this heading"></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="Link 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="Link 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="Link 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="Link 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>
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<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="Link 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="Link 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">
<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>
<p>Use this for numeric comparisons, e.g. <code class="docutils literal notranslate"><span class="pre">#if</span> <span class="pre">PY_VERSION_HEX</span> <span class="pre">&gt;=</span> <span class="pre">...</span></code>.</p>
<p>This version is also available via the symbol <a class="reference internal" href="#c.Py_Version" title="Py_Version"><code class="xref c c-var docutils literal notranslate"><span class="pre">Py_Version</span></code></a>.</p>
</dd></dl>
<dl class="c var">
<dt class="sig sig-object c" id="c.Py_Version">
<span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">unsigned</span></span><span class="w"> </span><span class="kt"><span class="pre">long</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">Py_Version</span></span></span><a class="headerlink" href="#c.Py_Version" title="Link to this definition"></a><br /></dt>
<dd><em class="stableabi"> Part of the <a class="reference internal" href="stable.html#stable"><span class="std std-ref">Stable ABI</span></a> since version 3.11.</em><p>The Python runtime version number encoded in a single constant integer, with
the same format as the <a class="reference internal" href="#c.PY_VERSION_HEX" title="PY_VERSION_HEX"><code class="xref c c-macro docutils literal notranslate"><span class="pre">PY_VERSION_HEX</span></code></a> macro.
This contains the Python version used at run time.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.11.</span></p>
</div>
</dd></dl>
<p>All the given macros are defined in <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.13/Include/patchlevel.h">Include/patchlevel.h</a>.</p>
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