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<li><a class="reference internal" href="#build-time-version-constants">Build-time version constants</a></li>
<li><a class="reference internal" href="#run-time-version">Run-time version</a></li>
<li><a class="reference internal" href="#bit-packing-macros">Bit-packing macros</a></li>
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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>
<section id="build-time-version-constants">
<h2>Build-time version constants<a class="headerlink" href="#build-time-version-constants" title="Link to this heading">¶</a></h2>
<p>CPython exposes its version number in the following macros.
Note that these correspond to the version code is <strong>built</strong> with.
See <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> for 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>

<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="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.
See <a class="reference internal" href="#c.Py_PACK_FULL_VERSION" title="Py_PACK_FULL_VERSION"><code class="xref c c-func docutils literal notranslate"><span class="pre">Py_PACK_FULL_VERSION()</span></code></a> for the encoding details.</p>
<p>Use this for numeric comparisons, for example,
<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>
</dd></dl>

<p>These macros are defined in <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/3.14/Include/patchlevel.h">Include/patchlevel.h</a>.</p>
</section>
<section id="run-time-version">
<h2>Run-time version<a class="headerlink" href="#run-time-version" title="Link to this heading">¶</a></h2>
<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.
See <a class="reference internal" href="#c.Py_PACK_FULL_VERSION" title="Py_PACK_FULL_VERSION"><code class="xref c c-func docutils literal notranslate"><span class="pre">Py_PACK_FULL_VERSION()</span></code></a> for the encoding details.
This contains the Python version used at run time.</p>
<p>Use this for numeric comparisons, for example, <code class="docutils literal notranslate"><span class="pre">if</span> <span class="pre">(Py_Version</span> <span class="pre">&gt;=</span> <span class="pre">...)</span></code>.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.11.</span></p>
</div>
</dd></dl>

</section>
<section id="bit-packing-macros">
<h2>Bit-packing macros<a class="headerlink" href="#bit-packing-macros" title="Link to this heading">¶</a></h2>
<dl class="c function">
<dt class="sig sig-object c" id="c.Py_PACK_FULL_VERSION">
<span class="n"><span class="pre">uint32_t</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">Py_PACK_FULL_VERSION</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">major</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">minor</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">micro</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">release_level</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">release_serial</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.Py_PACK_FULL_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 3.14.</em><p>Return the given version, encoded as a single 32-bit integer with
the following structure:</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head" rowspan="2"><p>Argument</p></th>
<th class="head" rowspan="2"><p>No.
of
bits</p></th>
<th class="head" rowspan="2"><p>Bit mask</p></th>
<th class="head" rowspan="2"><p>Bit shift</p></th>
<th class="head" colspan="2"><p>Example values</p></th>
</tr>
<tr class="row-even"><th class="head"><p><code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code></p></th>
<th class="head"><p><code class="docutils literal notranslate"><span class="pre">3.10.0</span></code></p></th>
</tr>
</thead>
<tbody>
<tr class="row-odd"><td><p><em>major</em></p></td>
<td><p>8</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0xFF000000</span></code></p></td>
<td><p>24</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x03</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x03</span></code></p></td>
</tr>
<tr class="row-even"><td><p><em>minor</em></p></td>
<td><p>8</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x00FF0000</span></code></p></td>
<td><p>16</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x04</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x0A</span></code></p></td>
</tr>
<tr class="row-odd"><td><p><em>micro</em></p></td>
<td><p>8</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x0000FF00</span></code></p></td>
<td><p>8</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x01</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x00</span></code></p></td>
</tr>
<tr class="row-even"><td><p><em>release_level</em></p></td>
<td><p>4</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x000000F0</span></code></p></td>
<td><p>4</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0xA</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0xF</span></code></p></td>
</tr>
<tr class="row-odd"><td><p><em>release_serial</em></p></td>
<td><p>4</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x0000000F</span></code></p></td>
<td><p>0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x2</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x0</span></code></p></td>
</tr>
</tbody>
</table>
<p>For example:</p>
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Version</p></th>
<th class="head"><p><code class="docutils literal notranslate"><span class="pre">Py_PACK_FULL_VERSION</span></code> arguments</p></th>
<th class="head"><p>Encoded version</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">(3,</span> <span class="pre">4,</span> <span class="pre">1,</span> <span class="pre">0xA,</span> <span class="pre">2)</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x030401a2</span></code></p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">3.10.0</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">(3,</span> <span class="pre">10,</span> <span class="pre">0,</span> <span class="pre">0xF,</span> <span class="pre">0)</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0x030a00f0</span></code></p></td>
</tr>
</tbody>
</table>
<p>Out-of range bits in the arguments are ignored.
That is, the macro can be defined as:</p>
<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#ifndef Py_PACK_FULL_VERSION</span>
<span class="cp">#define Py_PACK_FULL_VERSION(X, Y, Z, LEVEL, SERIAL) ( \</span>
<span class="cp">   (((X) &amp; 0xff) &lt;&lt; 24) |                              \</span>
<span class="cp">   (((Y) &amp; 0xff) &lt;&lt; 16) |                              \</span>
<span class="cp">   (((Z) &amp; 0xff) &lt;&lt; 8) |                               \</span>
<span class="cp">   (((LEVEL) &amp; 0xf) &lt;&lt; 4) |                            \</span>
<span class="cp">   (((SERIAL) &amp; 0xf) &lt;&lt; 0))</span>
<span class="cp">#endif</span>
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">Py_PACK_FULL_VERSION</span></code> is primarily a macro, intended for use in
<code class="docutils literal notranslate"><span class="pre">#if</span></code> directives, but it is also available as an exported function.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.14.</span></p>
</div>
</dd></dl>

<dl class="c function">
<dt class="sig sig-object c" id="c.Py_PACK_VERSION">
<span class="n"><span class="pre">uint32_t</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">Py_PACK_VERSION</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">major</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">minor</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.Py_PACK_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 3.14.</em><p>Equivalent to <code class="docutils literal notranslate"><span class="pre">Py_PACK_FULL_VERSION(major,</span> <span class="pre">minor,</span> <span class="pre">0,</span> <span class="pre">0,</span> <span class="pre">0)</span></code>.
The result does not correspond to any Python release, but is useful
in numeric comparisons.</p>
<div class="versionadded">
<p><span class="versionmodified added">Added in version 3.14.</span></p>
</div>
</dd></dl>

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