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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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<title>The None Object — Python 3.7.0 說明文件</title>
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<div class="section" id="the-none-object">
<span id="noneobject"></span><h1>The <code class="docutils literal notranslate"><span class="pre">None</span></code> Object<a class="headerlink" href="#the-none-object" title="本標題的永久連結">¶</a></h1>
<p id="index-0">Note that the <a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject"><code class="xref c c-type docutils literal notranslate"><span class="pre">PyTypeObject</span></code></a> for <code class="docutils literal notranslate"><span class="pre">None</span></code> is not directly exposed in the
Python/C API. Since <code class="docutils literal notranslate"><span class="pre">None</span></code> is a singleton, testing for object identity (using
<code class="docutils literal notranslate"><span class="pre">==</span></code> in C) is sufficient. There is no <code class="xref c c-func docutils literal notranslate"><span class="pre">PyNone_Check()</span></code> function for the
same reason.</p>
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<dt id="c.Py_None">
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="descname">Py_None</code><a class="headerlink" href="#c.Py_None" title="本定義的永久連結">¶</a></dt>
<dd><p>The Python <code class="docutils literal notranslate"><span class="pre">None</span></code> object, denoting lack of value. This object has no methods.
It needs to be treated just like any other object with respect to reference
counts.</p>
</dd></dl>
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<dt id="c.Py_RETURN_NONE">
<code class="descname">Py_RETURN_NONE</code><a class="headerlink" href="#c.Py_RETURN_NONE" title="本定義的永久連結">¶</a></dt>
<dd><p>Properly handle returning <a class="reference internal" href="#c.Py_None" title="Py_None"><code class="xref c c-data docutils literal notranslate"><span class="pre">Py_None</span></code></a> from within a C function (that is,
increment the reference count of <code class="docutils literal notranslate"><span class="pre">None</span></code> and return it.)</p>
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