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  181.   <section id="api-and-abi-versioning">

  182. <span id="apiabiversion"></span><h1>API and ABI Versioning<a class="headerlink" href="#api-and-abi-versioning" title="Link to this heading">¶</a></h1>

  183. <p>CPython exposes its version number in the following macros.

  184. Note that these correspond to the version code is <strong>built</strong> with,

  185. not necessarily the version used at <strong>run time</strong>.</p>

  186. <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>

  187. <dl class="c macro">

  188. <dt class="sig sig-object c" id="c.PY_MAJOR_VERSION">

  189. <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>

  190. <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>

  191. </dd></dl>

  192. 

  193. <dl class="c macro">

  194. <dt class="sig sig-object c" id="c.PY_MINOR_VERSION">

  195. <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>

  196. <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>

  197. </dd></dl>

  198. 

  199. <dl class="c macro">

  200. <dt class="sig sig-object c" id="c.PY_MICRO_VERSION">

  201. <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>

  202. <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>

  203. </dd></dl>

  204. 

  205. <dl class="c macro">

  206. <dt class="sig sig-object c" id="c.PY_RELEASE_LEVEL">

  207. <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>

  208. <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>.

  209. 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

  210. candidate or <code class="docutils literal notranslate"><span class="pre">0xF</span></code> for final.</p>

  211. </dd></dl>

  212. 

  213. <dl class="c macro">

  214. <dt class="sig sig-object c" id="c.PY_RELEASE_SERIAL">

  215. <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>

  216. <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>

  217. </dd></dl>

  218. 

  219. <dl class="c macro">

  220. <dt class="sig sig-object c" id="c.PY_VERSION_HEX">

  221. <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>

  222. <dd><p>The Python version number encoded in a single integer.</p>

  223. <p>The underlying version information can be found by treating it as a 32 bit

  224. number in the following manner:</p>

  225. <table class="docutils align-default">

  226. <thead>

  227. <tr class="row-odd"><th class="head"><p>Bytes</p></th>

  228. <th class="head"><p>Bits (big endian order)</p></th>

  229. <th class="head"><p>Meaning</p></th>

  230. <th class="head"><p>Value for <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code></p></th>

  231. </tr>

  232. </thead>

  233. <tbody>

  234. <tr class="row-even"><td><p>1</p></td>

  235. <td><p>1-8</p></td>

  236. <td><p><code class="docutils literal notranslate"><span class="pre">PY_MAJOR_VERSION</span></code></p></td>

  237. <td><p><code class="docutils literal notranslate"><span class="pre">0x03</span></code></p></td>

  238. </tr>

  239. <tr class="row-odd"><td><p>2</p></td>

  240. <td><p>9-16</p></td>

  241. <td><p><code class="docutils literal notranslate"><span class="pre">PY_MINOR_VERSION</span></code></p></td>

  242. <td><p><code class="docutils literal notranslate"><span class="pre">0x04</span></code></p></td>

  243. </tr>

  244. <tr class="row-even"><td><p>3</p></td>

  245. <td><p>17-24</p></td>

  246. <td><p><code class="docutils literal notranslate"><span class="pre">PY_MICRO_VERSION</span></code></p></td>

  247. <td><p><code class="docutils literal notranslate"><span class="pre">0x01</span></code></p></td>

  248. </tr>

  249. <tr class="row-odd"><td rowspan="2"><p>4</p></td>

  250. <td><p>25-28</p></td>

  251. <td><p><code class="docutils literal notranslate"><span class="pre">PY_RELEASE_LEVEL</span></code></p></td>

  252. <td><p><code class="docutils literal notranslate"><span class="pre">0xA</span></code></p></td>

  253. </tr>

  254. <tr class="row-even"><td><p>29-32</p></td>

  255. <td><p><code class="docutils literal notranslate"><span class="pre">PY_RELEASE_SERIAL</span></code></p></td>

  256. <td><p><code class="docutils literal notranslate"><span class="pre">0x2</span></code></p></td>

  257. </tr>

  258. </tbody>

  259. </table>

  260. <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

  261. hexversion <code class="docutils literal notranslate"><span class="pre">0x030a00f0</span></code>.</p>

  262. <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>

  263. <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>

  264. </dd></dl>

  265. 

  266. <dl class="c var">

  267. <dt class="sig sig-object c" id="c.Py_Version">

  268. <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>

  269. <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

  270. 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.

  271. This contains the Python version used at run time.</p>

  272. <div class="versionadded">

  273. <p><span class="versionmodified added">New in version 3.11.</span></p>

  274. </div>

  275. </dd></dl>

  276. 

  277. <p>All the given macros are defined in <a class="reference external" href="https://github.com/python/cpython/tree/3.12/Include/patchlevel.h">Include/patchlevel.h</a>.</p>

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  390. <a href="https://www.python.org/psf/donations/">Please donate.</a>

  391. <br />

  392.     <br />

  393.       Last updated on Apr 09, 2024 (13:47 UTC).

  394.     

  395.       <a href="/bugs.html">Found a bug</a>?

  396.     

  397.     <br />

  398. 

  399.     Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 7.2.6.

  400.     </div>

  401. 

  402.   </body>

  403. </html>
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