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<section id="api-and-abi-versioning">
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<span id="apiabiversion"></span><h1>API 和 ABI 版本管理<a class="headerlink" href="#api-and-abi-versioning" title="永久链接至标题">¶</a></h1>
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<p><code class="docutils literal notranslate"><span class="pre">PY_VERSION_HEX</span></code> 是Python的版本号的整数形式。</p>
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<p>例如，如果 <code class="docutils literal notranslate"><span class="pre">PY_VERSION_HEX</span></code> 被置为 <code class="docutils literal notranslate"><span class="pre">0x030401a2</span></code>, 其包含的版本信息可以通过以下方式将其作为一个32位数字来处理：</p>
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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>字节串</p></th>
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<th class="head"><p>位数（大端字节序）</p></th>
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<th class="head"><p>含意</p></th>
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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> （<code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code> 中的 <code class="docutils literal notranslate"><span class="pre">3</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> （<code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code> 中的 <code class="docutils literal notranslate"><span class="pre">4</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> （<code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code> 中的 <code class="docutils literal notranslate"><span class="pre">1</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> 是 alpha版本, <code class="docutils literal notranslate"><span class="pre">0xB</span></code> 是 beta版本, <code class="docutils literal notranslate"><span class="pre">0xC</span></code> 发布的候选版本并且 <code class="docutils literal notranslate"><span class="pre">0xF</span></code> 是最终版本)，在这个例子中这个版本是alpha版本。</p></td>
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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> （ <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code> 中的 <code class="docutils literal notranslate"><span class="pre">2</span></code> ，最终版本用0)</p></td>
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<p>因此 <code class="docutils literal notranslate"><span class="pre">3.4.1a2</span></code> 的16进制版本号是 <code class="docutils literal notranslate"><span class="pre">0x030401a2</span></code> 。</p>
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<p>所有提到的宏都定义在 <a class="reference external" href="https://github.com/python/cpython/tree/3.8/Include/patchlevel.h">Include/patchlevel.h</a>。</p>
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