/lib/lib.html" title=
              "Python Library Reference">Python Library Reference</a></em>.
            </p>
          </dd>
        </dl>
        <dl>
          <dt>
            <b><a name="l2h-133"><tt class=
            "method">__contains__</tt></a></b>(<var>self, item</var>)
          </dt>
          <dd>
            Called to implement membership test operators. Should return true
            if <var>item</var> is in <var>self</var>, false otherwise. For
            mapping objects, this should 