m root:</span>
<span class="sd">        :param first:</span>
<span class="sd">        :param last:</span>
<span class="sd">        :param weight:</span>
<span class="sd">        :param begin_time:</span>
<span class="sd">        :param end_time:</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span
            class="n">root</span>
        <span class="bp">self</span><span class="o">.</