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<H1><A NAME="SECTION005500000000000000000">
3.5 <tt class="module">UserDict</tt> --
         Class wrapper for dictionary objects</A>
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<P>


<P>
This module defines a class that acts as a wrapper around
dictionary objects.  It is a useful base class for
your own dictionary-like classes, which can inherit from
them and override existing methods or add new ones.  In this way one
can add new behaviors to dictionaries.

<P>
The <tt class="module">UserDict</tt> module defines the <tt class="class">UserDict</tt> class:

<P>
<dl><dt><b><a name='l2h-317'><tt class='class'>UserDict</tt></a></b> (<big>[</big><var>initialdata</var><big>]</big>)
<dd>
Class that simulates a dictionary.  The instance's
contents are kept in a regular dictionary, which is accessible via the
<tt class="member">data</tt> attribute of <tt class="class">UserDict</tt> instances.  If
<var>initialdata</var> is provided, <tt class="member">data</tt> is initialized with its
contents; note that a reference to <var>initialdata</var> will not be kept, 
allowing it be used used for other purposes.
</dl>

<P>
In addition to supporting the methods and operations of mappings (see
section <A href="typesmapping.html#typesmapping" tppabs="http://www.python.org/doc/current/lib/typesmapping.html#typesmapping">2.1.6</A>), <tt class="class">UserDict</tt> instances provide the
following attribute:

<P>
<dl><dt><b><a name='l2h-318'><tt class='member'>data</tt></a></b>
<dd>
A real dictionary used to store the contents of the <tt class="class">UserDict</tt>
class.
</dl>

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