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  &lt;div class=&quot;section&quot; id=&quot;module-copy_reg&quot;&gt;
&lt;span id=&quot;copy-reg-register-pickle-support-functions&quot;&gt;&lt;/span&gt;&lt;h1&gt;11.3. &lt;a class=&quot;reference internal&quot; href=&quot;#module-copy_reg&quot; title=&quot;copy_reg: Register pickle support functions.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;copy_reg&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; &amp;#8212; Register &lt;a class=&quot;reference internal&quot; href=&quot;pickle.html#module-pickle&quot; title=&quot;pickle: Convert Python objects to streams of bytes and back.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pickle&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; support functions&lt;a class=&quot;headerlink&quot; href=&quot;#module-copy_reg&quot; title=&quot;Permalink to this headline&quot;&gt;¶&lt;/a&gt;&lt;/h1&gt;
&lt;div class=&quot;admonition note&quot;&gt;
&lt;p class=&quot;first admonition-title&quot;&gt;Note&lt;/p&gt;
&lt;p class=&quot;last&quot;&gt;The &lt;a class=&quot;reference internal&quot; href=&quot;#module-copy_reg&quot; title=&quot;copy_reg: Register pickle support functions.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;copy_reg&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; module has been renamed to &lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;copyreg&lt;/span&gt;&lt;/tt&gt; in Python 3.
The &lt;a class=&quot;reference internal&quot; href=&quot;../glossary.html#term-to3&quot;&gt;&lt;em class=&quot;xref std std-term&quot;&gt;2to3&lt;/em&gt;&lt;/a&gt; tool will automatically adapt imports when converting your
sources to Python 3.&lt;/p&gt;
&lt;/div&gt;
&lt;p id=&quot;index-0&quot;&gt;The &lt;a class=&quot;reference internal&quot; href=&quot;#module-copy_reg&quot; title=&quot;copy_reg: Register pickle support functions.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;copy_reg&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; module offers a way to define fuctions used while pickling
specific objects.  The &lt;a class=&quot;reference internal&quot; href=&quot;pickle.html#module-pickle&quot; title=&quot;pickle: Convert Python objects to streams of bytes and back.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pickle&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt;, &lt;a class=&quot;reference internal&quot; href=&quot;pickle.html#module-cPickle&quot; title=&quot;cPickle: Faster version of pickle, but not subclassable.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;cPickle&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt;, and &lt;a class=&quot;reference internal&quot; href=&quot;copy.html#module-copy&quot; title=&quot;copy: Shallow and deep copy operations.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;copy&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; modules
use those functions when pickling/copying those objects.  The module provides
configuration information about object constructors which are not classes.
Such constructors may be factory functions or class instances.&lt;/p&gt;
&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;copy_reg.constructor&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;copy_reg.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;constructor&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;em&gt;object&lt;/em&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#copy_reg.constructor&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;Declares &lt;em&gt;object&lt;/em&gt; to be a valid constructor.  If &lt;em&gt;object&lt;/em&gt; is not callable (and
hence not valid as a constructor), raises &lt;a class=&quot;reference internal&quot; href=&quot;exceptions.html#exceptions.TypeError&quot; title=&quot;exceptions.TypeError&quot;&gt;&lt;tt class=&quot;xref py py-exc docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;TypeError&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt;.&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

&lt;dl class=&quot;function&quot;&gt;
&lt;dt id=&quot;copy_reg.pickle&quot;&gt;
&lt;tt class=&quot;descclassname&quot;&gt;copy_reg.&lt;/tt&gt;&lt;tt class=&quot;descname&quot;&gt;pickle&lt;/tt&gt;&lt;big&gt;(&lt;/big&gt;&lt;em&gt;type&lt;/em&gt;, &lt;em&gt;function&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;[&lt;/span&gt;, &lt;em&gt;constructor&lt;/em&gt;&lt;span class=&quot;optional&quot;&gt;]&lt;/span&gt;&lt;big&gt;)&lt;/big&gt;&lt;a class=&quot;headerlink&quot; href=&quot;#copy_reg.pickle&quot; title=&quot;Permalink to this definition&quot;&gt;¶&lt;/a&gt;&lt;/dt&gt;
&lt;dd&gt;&lt;p&gt;Declares that &lt;em&gt;function&lt;/em&gt; should be used as a &amp;#8220;reduction&amp;#8221; function for objects of
type &lt;em&gt;type&lt;/em&gt;; &lt;em&gt;type&lt;/em&gt; must not be a &amp;#8220;classic&amp;#8221; class object.  (Classic classes are
handled differently; see the documentation for the &lt;a class=&quot;reference internal&quot; href=&quot;pickle.html#module-pickle&quot; title=&quot;pickle: Convert Python objects to streams of bytes and back.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pickle&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; module for
details.)  &lt;em&gt;function&lt;/em&gt; should return either a string or a tuple containing two or
three elements.&lt;/p&gt;
&lt;p&gt;The optional &lt;em&gt;constructor&lt;/em&gt; parameter, if provided, is a callable object which
can be used to reconstruct the object when called with the tuple of arguments
returned by &lt;em&gt;function&lt;/em&gt; at pickling time.  &lt;a class=&quot;reference internal&quot; href=&quot;exceptions.html#exceptions.TypeError&quot; title=&quot;exceptions.TypeError&quot;&gt;&lt;tt class=&quot;xref py py-exc docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;TypeError&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; will be raised if
&lt;em&gt;object&lt;/em&gt; is a class or &lt;em&gt;constructor&lt;/em&gt; is not callable.&lt;/p&gt;
&lt;p&gt;See the &lt;a class=&quot;reference internal&quot; href=&quot;pickle.html#module-pickle&quot; title=&quot;pickle: Convert Python objects to streams of bytes and back.&quot;&gt;&lt;tt class=&quot;xref py py-mod docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pickle&lt;/span&gt;&lt;/tt&gt;&lt;/a&gt; module for more details on the interface expected of
&lt;em&gt;function&lt;/em&gt; and &lt;em&gt;constructor&lt;/em&gt;.&lt;/p&gt;
&lt;/dd&gt;&lt;/dl&gt;

&lt;div class=&quot;section&quot; id=&quot;example&quot;&gt;
&lt;h2&gt;11.3.1. Example&lt;a class=&quot;headerlink&quot; href=&quot;#example&quot; title=&quot;Permalink to this headline&quot;&gt;¶&lt;/a&gt;&lt;/h2&gt;
&lt;p&gt;The example below would like to show how to register a pickle function and how
it will be used:&lt;/p&gt;
&lt;div class=&quot;highlight-python&quot;&gt;&lt;div class=&quot;highlight&quot;&gt;&lt;pre&gt;&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;kn&quot;&gt;import&lt;/span&gt; &lt;span class=&quot;nn&quot;&gt;copy_reg&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;,&lt;/span&gt; &lt;span class=&quot;nn&quot;&gt;copy&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;,&lt;/span&gt; &lt;span class=&quot;nn&quot;&gt;pickle&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;k&quot;&gt;class&lt;/span&gt; &lt;span class=&quot;nc&quot;&gt;C&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;nb&quot;&gt;object&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;):&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;... &lt;/span&gt;    &lt;span class=&quot;k&quot;&gt;def&lt;/span&gt; &lt;span class=&quot;nf&quot;&gt;__init__&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;bp&quot;&gt;self&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;,&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;a&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;):&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;... &lt;/span&gt;        &lt;span class=&quot;bp&quot;&gt;self&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;a&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;=&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;a&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;...&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;k&quot;&gt;def&lt;/span&gt; &lt;span class=&quot;nf&quot;&gt;pickle_c&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;c&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;):&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;... &lt;/span&gt;    &lt;span class=&quot;k&quot;&gt;print&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;s&quot;&gt;&amp;quot;pickling a C instance...&amp;quot;&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;... &lt;/span&gt;    &lt;span class=&quot;k&quot;&gt;return&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;C&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;,&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;c&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;a&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;,)&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;...&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;n&quot;&gt;copy_reg&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;pickle&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;C&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;,&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;pickle_c&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;n&quot;&gt;c&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;=&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;C&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;mi&quot;&gt;1&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;n&quot;&gt;d&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;=&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;copy&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;copy&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;c&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt;
&lt;span class=&quot;go&quot;&gt;pickling a C instance...&lt;/span&gt;
&lt;span class=&quot;gp&quot;&gt;&amp;gt;&amp;gt;&amp;gt; &lt;/span&gt;&lt;span class=&quot;n&quot;&gt;p&lt;/span&gt; &lt;span class=&quot;o&quot;&gt;=&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;pickle&lt;/span&gt;&lt;span class=&quot;o&quot;&gt;.&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;dumps&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;c&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;)&lt;/span&gt;
&lt;span class=&quot;go&quot;&gt;pickling a C instance...&lt;/span&gt;
&lt;/pre&gt;&lt;/div&gt;
&lt;/div&gt;
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  &lt;h3&gt;&lt;a href=&quot;../contents.html&quot;&gt;Table Of Contents&lt;/a&gt;&lt;/h3&gt;
  &lt;ul&gt;
&lt;li&gt;&lt;a class=&quot;reference internal&quot; href=&quot;#&quot;&gt;11.3. &lt;tt class=&quot;docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;copy_reg&lt;/span&gt;&lt;/tt&gt; &amp;#8212; Register &lt;tt class=&quot;docutils literal&quot;&gt;&lt;span class=&quot;pre&quot;&gt;pickle&lt;/span&gt;&lt;/tt&gt; support functions&lt;/a&gt;&lt;ul&gt;
&lt;li&gt;&lt;a class=&quot;reference internal&quot; href=&quot;#example&quot;&gt;11.3.1. Example&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;/li&gt;
&lt;/ul&gt;

  &lt;h4&gt;Previous topic&lt;/h4&gt;
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  &lt;h4&gt;Next topic&lt;/h4&gt;
  &lt;p class=&quot;topless&quot;&gt;&lt;a href=&quot;shelve.html&quot;
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