pan class="n">prop</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">properties</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
            <span class="n">n_features</span> <span class="o">+=</span> <span class="n">prop</span><span class="p">[</span><span class="s2">&quot;n&quot;</span><span class="p">]</span>

        <span class="k">return</span> <span class="n">n_features</span></div>

<div class="viewcode-block" i