n container. The class automatically wraps these

      special Python methods (taken from the Python reference: <a href=

      "http://www.python.org/doc/current/ref/sequence-types.html">Emulating

      container types</a>):

    </p>

    <dl>

      <dd>

        <dl>

          <dt>

            <b><a name="l2h-126"><tt class=

            "method">__len__</tt></a></b>(<var>self</var>)

          </dt>

          <dd>

            Called to implement the built-in function <tt class=

   