>,</span> <span class="bp">self</span><span class="p">)</span>

    <span class="k">def</span><span class="w"> </span><span class="fm">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="w">        </span><span class="sd">&quot;&quot;&quot;Get size.</span>

<span class="sd">        Returns:</span>
<span class="sd">            size(int): Size.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">return</span> <span class="nb">l