   <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Return (x_pos,y_pos==depth)</span>

<span class="sd">        :param node:</span>
<span class="sd">        :param depth:</span>
<span class="sd">        :return:</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="ow">not</span> <span class="n">N</span><span class="p">:</span>
            <span class="n">N</span> <span class="o">=</span> <span class="p">[]</span>
        <span class="k"