an class="n">TimeDelta</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="s1">&#39;self&#39;</span><span class="p">:</span>
<span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Extend the time range by modifying the start and end times.</span>

<span class="sd">        :param start_delta: The amount of time to add to the start of the range.</span>
<span class="sd">        :type start_delta: TimeDelta</span>
<span class="sd">        :param e