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<section id="module-copyreg">
<span id="copyreg-register-pickle-support-functions"></span><h1><a class="reference internal" href="#module-copyreg" title="copyreg: Register pickle support functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">copyreg</span></code></a> --- 注册配合 <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a> 模块使用的函数<a class="headerlink" href="#module-copyreg" title="永久链接至标题"></a></h1>
<p><strong>源代码:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.8/Lib/copyreg.py">Lib/copyreg.py</a></p>
<hr class="docutils" id="index-0" />
<p><a class="reference internal" href="#module-copyreg" title="copyreg: Register pickle support functions."><code class="xref py py-mod docutils literal notranslate"><span class="pre">copyreg</span></code></a> 模块提供了可在封存特定对象时使用的一种定义函数方式。 <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a> 和 <a class="reference internal" href="copy.html#module-copy" title="copy: Shallow and deep copy operations."><code class="xref py py-mod docutils literal notranslate"><span class="pre">copy</span></code></a> 模块会在封存/拷贝特定对象时使用这些函数。 此模块提供了非类对象构造器的相关配置信息。 这样的构造器可以是工厂函数或类实例。</p>
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<code class="sig-prename descclassname">copyreg.</code><code class="sig-name descname">constructor</code><span class="sig-paren">(</span><em class="sig-param">object</em><span class="sig-paren">)</span><a class="headerlink" href="#copyreg.constructor" title="永久链接至目标"></a></dt>
<dd><p>将 <em>object</em> 声明为一个有效的构造器。 如果 <em>object</em> 是不可调用的（因而不是一个有效的构造器）则会引发 <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a>。</p>
</dd></dl>
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<dt id="copyreg.pickle">
<code class="sig-prename descclassname">copyreg.</code><code class="sig-name descname">pickle</code><span class="sig-paren">(</span><em class="sig-param">type</em>, <em class="sig-param">function</em>, <em class="sig-param">constructor=None</em><span class="sig-paren">)</span><a class="headerlink" href="#copyreg.pickle" title="永久链接至目标"></a></dt>
<dd><p>声明该 <em>function</em> 应当被用作 <em>type</em> 类型对象的“归约函数”。 <em>function</em> 应当返回字符串或包含两到三个元素的元组。</p>
<p>如果提供了可选的 <em>constructor</em> 形参，它应当是一个可用来重建相应对象的可调用对象，在调用该对象时应传入由 <em>function</em> 所返回的参数元组。 如果 <em>object</em> 是一个类或 <em>constructor</em> 是不可调用的则将引发 <a class="reference internal" href="exceptions.html#TypeError" title="TypeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TypeError</span></code></a>。</p>
<p>请查看 <a class="reference internal" href="pickle.html#module-pickle" title="pickle: Convert Python objects to streams of bytes and back."><code class="xref py py-mod docutils literal notranslate"><span class="pre">pickle</span></code></a> 模块了解 <em>function</em> 和 <em>constructor</em> 所要求的接口的详情。 请注意一个 pickler 对象或 <a class="reference internal" href="pickle.html#pickle.Pickler" title="pickle.Pickler"><code class="xref py py-class docutils literal notranslate"><span class="pre">pickle.Pickler</span></code></a> 的子类的 <a class="reference internal" href="pickle.html#pickle.Pickler.dispatch_table" title="pickle.Pickler.dispatch_table"><code class="xref py py-attr docutils literal notranslate"><span class="pre">dispatch_table</span></code></a> 属性也可以被用来声明归约函数。</p>
</dd></dl>
<section id="example">
<h2>示例<a class="headerlink" href="#example" title="永久链接至标题"></a></h2>
<p>以下示例将会显示如何注册一个封存函数，以及如何来使用它：</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">copyreg</span><span class="o">,</span> <span class="nn">copy</span><span class="o">,</span> <span class="nn">pickle</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">class</span> <span class="nc">C</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">a</span><span class="p">):</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">a</span> <span class="o">=</span> <span class="n">a</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">def</span> <span class="nf">pickle_c</span><span class="p">(</span><span class="n">c</span><span class="p">):</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;pickling a C instance...&quot;</span><span class="p">)</span>
<span class="gp">... </span> <span class="k">return</span> <span class="n">C</span><span class="p">,</span> <span class="p">(</span><span class="n">c</span><span class="o">.</span><span class="n">a</span><span class="p">,)</span>
<span class="gp">...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">copyreg</span><span class="o">.</span><span class="n">pickle</span><span class="p">(</span><span class="n">C</span><span class="p">,</span> <span class="n">pickle_c</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">c</span> <span class="o">=</span> <span class="n">C</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">d</span> <span class="o">=</span> <span class="n">copy</span><span class="o">.</span><span class="n">copy</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="go">pickling a C instance...</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">p</span> <span class="o">=</span> <span class="n">pickle</span><span class="o">.</span><span class="n">dumps</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="go">pickling a C instance...</span>
</pre></div>
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