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<section id="slice-objects">
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<span id="id1"></span><h1>切片对象<a class="headerlink" href="#slice-objects" title="永久链接至标题">¶</a></h1>
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<dl class="var">
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<dt id="c.PySlice_Type">
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<a class="reference internal" href="type.html#c.PyTypeObject" title="PyTypeObject">PyTypeObject</a> <code class="sig-name descname">PySlice_Type</code><a class="headerlink" href="#c.PySlice_Type" title="永久链接至目标">¶</a></dt>
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<dd><p>切片对象的类型对象。 它与 Python 层面的 <a class="reference internal" href="../library/functions.html#slice" title="slice"><code class="xref py py-class docutils literal notranslate"><span class="pre">slice</span></code></a> 是相同的对象。</p>
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</dd></dl>
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<dl class="function">
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<dt id="c.PySlice_Check">
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int <code class="sig-name descname">PySlice_Check</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *ob</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_Check" title="永久链接至目标">¶</a></dt>
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<dd><p>如果 <em>ob</em> 是一个 slice 对象则返回真值；<em>ob</em> 必须不为 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。</p>
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</dd></dl>
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<dl class="function">
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<dt id="c.PySlice_New">
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<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a>* <code class="sig-name descname">PySlice_New</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *start</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *stop</em>, <a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *step</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_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>返回一个具有给定值的新切片对象。 <em>start</em>, <em>stop</em> 和 <em>step</em> 形参会被用作 slice 对象相应名称的属性的值。 这些值中的任何一个都可以为 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>，在这种情况下将使用 <code class="docutils literal notranslate"><span class="pre">None</span></code> 作为对应属性的值。 如果新对象无法被分配则返回 <code class="docutils literal notranslate"><span class="pre">NULL</span></code>。</p>
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</dd></dl>
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<dl class="function">
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<dt id="c.PySlice_GetIndices">
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int <code class="sig-name descname">PySlice_GetIndices</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *slice</em>, Py_ssize_t<em> length</em>, Py_ssize_t<em> *start</em>, Py_ssize_t<em> *stop</em>, Py_ssize_t<em> *step</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_GetIndices" title="永久链接至目标">¶</a></dt>
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<dd><p>从切片对象 <em>slice</em> 提取 start, stop 和 step 索引号，将序列长度视为 <em>length</em>。 大于 <em>length</em> 的序列号将被当作错误。</p>
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<p>成功时返回 <code class="docutils literal notranslate"><span class="pre">0</span></code>，出错时返回 <code class="docutils literal notranslate"><span class="pre">-1</span></code> 并且不设置异常（除非某个序列号不为 <a class="reference internal" href="../library/constants.html#None" title="None"><code class="xref py py-const docutils literal notranslate"><span class="pre">None</span></code></a> 且无法被转换为整数，在这种情况下会返回 <code class="docutils literal notranslate"><span class="pre">-1</span></code> 并且设置一个异常）。</p>
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<p>你可能不会打算使用此函数。</p>
|
||
<div class="versionchanged">
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||
<p><span class="versionmodified changed">在 3.2 版更改: </span>之前 <em>slice</em> 形参的形参类型是 <code class="docutils literal notranslate"><span class="pre">PySliceObject*</span></code>。</p>
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</div>
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</dd></dl>
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<dl class="function">
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||
<dt id="c.PySlice_GetIndicesEx">
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int <code class="sig-name descname">PySlice_GetIndicesEx</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *slice</em>, Py_ssize_t<em> length</em>, Py_ssize_t<em> *start</em>, Py_ssize_t<em> *stop</em>, Py_ssize_t<em> *step</em>, Py_ssize_t<em> *slicelength</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_GetIndicesEx" title="永久链接至目标">¶</a></dt>
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<dd><p><a class="reference internal" href="#c.PySlice_GetIndices" title="PySlice_GetIndices"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_GetIndices()</span></code></a> 的可用替代。 从切片对象 <em>slice</em> 提取 start, stop 和 step 索引号，将序列长度视为 <em>length</em>，并将切片的长度保存在 <em>slicelength</em> 中，超出范围的索引号会以与普通切片一致的方式进行剪切。</p>
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<p>成功时返回 <code class="docutils literal notranslate"><span class="pre">0</span></code>，出错时返回 <code class="docutils literal notranslate"><span class="pre">-1</span></code> 并且不设置异常。</p>
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<div class="admonition note">
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<p class="admonition-title">注解</p>
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<p>此函数对于可变大小序列来说是不安全的。 对它的调用应被替换为 <a class="reference internal" href="#c.PySlice_Unpack" title="PySlice_Unpack"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_Unpack()</span></code></a> 和 <a class="reference internal" href="#c.PySlice_AdjustIndices" title="PySlice_AdjustIndices"><code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_AdjustIndices()</span></code></a> 的组合，其中</p>
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<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">PySlice_GetIndicesEx</span><span class="p">(</span><span class="n">slice</span><span class="p">,</span><span class="w"> </span><span class="n">length</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">start</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">stop</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">step</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">slicelength</span><span class="p">)</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="c1">// return error</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>会被替换为</p>
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<div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">PySlice_Unpack</span><span class="p">(</span><span class="n">slice</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">start</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">stop</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">step</span><span class="p">)</span><span class="w"> </span><span class="o"><</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="c1">// return error</span>
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<span class="p">}</span>
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<span class="n">slicelength</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">PySlice_AdjustIndices</span><span class="p">(</span><span class="n">length</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">start</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">stop</span><span class="p">,</span><span class="w"> </span><span class="n">step</span><span class="p">);</span>
|
||
</pre></div>
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</div>
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</div>
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||
<div class="versionchanged">
|
||
<p><span class="versionmodified changed">在 3.2 版更改: </span>之前 <em>slice</em> 形参的形参类型是 <code class="docutils literal notranslate"><span class="pre">PySliceObject*</span></code>。</p>
|
||
</div>
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||
<div class="versionchanged">
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||
<p><span class="versionmodified changed">在 3.6.1 版更改: </span>如果 <code class="docutils literal notranslate"><span class="pre">Py_LIMITED_API</span></code> 未设置或设置为 <code class="docutils literal notranslate"><span class="pre">0x03050400</span></code> 与 <code class="docutils literal notranslate"><span class="pre">0x03060000</span></code> 之间的值（不包括边界）或 <code class="docutils literal notranslate"><span class="pre">0x03060100</span></code> 或更大则 <code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_GetIndicesEx()</span></code> 会被实现为一个使用 <code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_Unpack()</span></code> 和 <code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_AdjustIndices()</span></code> 的宏。 参数 <em>start</em>, <em>stop</em> 和 <em>step</em> 会被多被求值。</p>
|
||
</div>
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||
<div class="deprecated">
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||
<p><span class="versionmodified deprecated">3.6.1 版后已移除: </span>如果 <code class="docutils literal notranslate"><span class="pre">Py_LIMITED_API</span></code> 设置为小于 <code class="docutils literal notranslate"><span class="pre">0x03050400</span></code> 或 <code class="docutils literal notranslate"><span class="pre">0x03060000</span></code> 与 <code class="docutils literal notranslate"><span class="pre">0x03060100</span></code> 之间的值（不包括边界）则 <code class="xref c c-func docutils literal notranslate"><span class="pre">PySlice_GetIndicesEx()</span></code> 为已弃用的函数。</p>
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||
</div>
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||
</dd></dl>
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<dl class="function">
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<dt id="c.PySlice_Unpack">
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int <code class="sig-name descname">PySlice_Unpack</code><span class="sig-paren">(</span><a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a><em> *slice</em>, Py_ssize_t<em> *start</em>, Py_ssize_t<em> *stop</em>, Py_ssize_t<em> *step</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_Unpack" title="永久链接至目标">¶</a></dt>
|
||
<dd><p>从切片对象中将 start, stop 和 step 数据成员提取为 C 整数。 会静默地将大于 <code class="docutils literal notranslate"><span class="pre">PY_SSIZE_T_MAX</span></code> 的值减小为 <code class="docutils literal notranslate"><span class="pre">PY_SSIZE_T_MAX</span></code>，静默地将小于 <code class="docutils literal notranslate"><span class="pre">PY_SSIZE_T_MIN</span></code> 的 start 和 stop 值增大为 <code class="docutils literal notranslate"><span class="pre">PY_SSIZE_T_MIN</span></code>，并静默地将小于 <code class="docutils literal notranslate"><span class="pre">-PY_SSIZE_T_MAX</span></code> 的 step 值增大为 <code class="docutils literal notranslate"><span class="pre">-PY_SSIZE_T_MAX</span></code>。</p>
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<p>出错时返回 <code class="docutils literal notranslate"><span class="pre">-1</span></code>，成功时返回 <code class="docutils literal notranslate"><span class="pre">0</span></code>。</p>
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<div class="versionadded">
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<p><span class="versionmodified added">3.6.1 新版功能.</span></p>
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</div>
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</dd></dl>
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<dl class="function">
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<dt id="c.PySlice_AdjustIndices">
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||
Py_ssize_t <code class="sig-name descname">PySlice_AdjustIndices</code><span class="sig-paren">(</span>Py_ssize_t<em> length</em>, Py_ssize_t<em> *start</em>, Py_ssize_t<em> *stop</em>, Py_ssize_t<em> step</em><span class="sig-paren">)</span><a class="headerlink" href="#c.PySlice_AdjustIndices" title="永久链接至目标">¶</a></dt>
|
||
<dd><p>将 start/end 切片索引号根据指定的序列长度进行调整。 超出范围的索引号会以与普通切片一致的方式进行剪切。</p>
|
||
<p>返回切片的长度。 此操作总是会成功。 不会调用 Python 代码。</p>
|
||
<div class="versionadded">
|
||
<p><span class="versionmodified added">3.6.1 新版功能.</span></p>
|
||
</div>
|
||
</dd></dl>
|
||
|
||
</section>
|
||
<section id="ellipsis-object">
|
||
<h1>Ellipsis 对象<a class="headerlink" href="#ellipsis-object" title="永久链接至标题">¶</a></h1>
|
||
<dl class="var">
|
||
<dt id="c.Py_Ellipsis">
|
||
<a class="reference internal" href="structures.html#c.PyObject" title="PyObject">PyObject</a> *<code class="sig-name descname">Py_Ellipsis</code><a class="headerlink" href="#c.Py_Ellipsis" title="永久链接至目标">¶</a></dt>
|
||
<dd><p>Python 的 <code class="docutils literal notranslate"><span class="pre">Ellipsis</span></code> 对象。 该对象没有任何方法。 它必须以与任何其他对象一样的方式遵循引用计数。 它与 <a class="reference internal" href="none.html#c.Py_None" title="Py_None"><code class="xref c c-data docutils literal notranslate"><span class="pre">Py_None</span></code></a> 一样属于单例对象。</p>
|
||
</dd></dl>
|
||
|
||
</section>
|
||
|
||
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||
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|
||
<li><a class="reference internal" href="#">切片对象</a></li>
|
||
<li><a class="reference internal" href="#ellipsis-object">Ellipsis 对象</a></li>
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最后更新于 12月 09, 2024.
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