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<section id="iterator-objects">
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<span id="id1"></span><h1>迭代器对象<a class="headerlink" href="#iterator-objects" title="永久链接至标题">¶</a></h1>
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<p>Python 提供了两个通用迭代器对象。 第一个是序列迭代器，它使用支持 <a class="reference internal" href="../reference/datamodel.html#object.__getitem__" title="object.__getitem__"><code class="xref py py-meth docutils literal notranslate"><span class="pre">__getitem__()</span></code></a> 方法的任意序列。 第二个使用可调用对象和一个 sentinel 值，为序列中的每个项调用可调用对象，并在返回 sentinel 值时结束迭代。</p>
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<dt id="c.PySeqIter_Type">
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<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="sig-name descname">PySeqIter_Type</code><a class="headerlink" href="#c.PySeqIter_Type" title="永久链接至目标">¶</a></dt>
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<dd><p><a class="reference internal" href="#c.PySeqIter_New" title="PySeqIter_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySeqIter_New()</span></code></a> 返回迭代器对象的类型对象和内置序列类型内置函数 <a class="reference internal" href="../library/functions.html#iter" title="iter"><code class="xref py py-func docutils literal notranslate"><span class="pre">iter()</span></code></a> 的单参数形式。</p>
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<dt id="c.PySeqIter_Check">
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int <code class="sig-name descname">PySeqIter_Check</code><span class="sig-paren">(</span>op<span class="sig-paren">)</span><a class="headerlink" href="#c.PySeqIter_Check" title="永久链接至目标">¶</a></dt>
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<dd><p>如果 <em>op</em> 的类型为 <a class="reference internal" href="#c.PySeqIter_Type" title="PySeqIter_Type"><code class="xref c c-data docutils literal notranslate"><span class="pre">PySeqIter_Type</span></code></a> 则返回 true。</p>
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<dt id="c.PySeqIter_New">
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<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="sig-name descname">PySeqIter_New</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *seq</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySeqIter_New" title="永久链接至目标">¶</a></dt>
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<dd><em class="refcount">Return value: New reference.</em><p>返回一个与常规序列对象一起使用的迭代器 <em>seq</em>。 当序列订阅操作引发 <a class="reference internal" href="../library/exceptions.html#IndexError" title="IndexError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">IndexError</span></code></a> 时，迭代结束。</p>
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<dt id="c.PyCallIter_Type">
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<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="sig-name descname">PyCallIter_Type</code><a class="headerlink" href="#c.PyCallIter_Type" title="永久链接至目标">¶</a></dt>
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<dd><p>由函数 <a class="reference internal" href="#c.PyCallIter_New" title="PyCallIter_New"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyCallIter_New()</span></code></a> 和 <a class="reference internal" href="../library/functions.html#iter" title="iter"><code class="xref py py-func docutils literal notranslate"><span class="pre">iter()</span></code></a> 内置函数的双参数形式返回的迭代器对象类型对象。</p>
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<dt id="c.PyCallIter_Check">
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int <code class="sig-name descname">PyCallIter_Check</code><span class="sig-paren">(</span>op<span class="sig-paren">)</span><a class="headerlink" href="#c.PyCallIter_Check" title="永久链接至目标">¶</a></dt>
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<dd><p>如果 <em>op</em> 的类型为 <a class="reference internal" href="#c.PyCallIter_Type" title="PyCallIter_Type"><code class="xref c c-data docutils literal notranslate"><span class="pre">PyCallIter_Type</span></code></a> 则返回 true。</p>
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<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="sig-name descname">PyCallIter_New</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *callable</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *sentinel</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PyCallIter_New" title="永久链接至目标">¶</a></dt>
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<dd><em class="refcount">Return value: New reference.</em><p>返回一个新的迭代器。 第一个参数 <em>callable</em> 可以是任何可以在没有参数的情况下调用的 Python 可调用对象；每次调用都应该返回迭代中的下一个项目。 当 <em>callable</em> 返回等于 <em>sentinel</em> 的值时，迭代将终止。</p>
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