lass="keyword">for</tt> loops expect that an <tt class=

                "exception">IndexError</tt> will be raised for illegal

                indexes to allow proper detection of the end of the

                sequence.</span>

          </dd>

        </dl>

        <dl>

          <dt>

            <b><a name="l2h-130"><tt class=

            "method">__setitem__</tt></a></b>(<var>self, key, value</var>)

          </dt>

          <dd>

            Called to implement assignment to

    