span>
        <span class="k">for</span> <span class="n">vertex</span><span class="p">,</span> <span class="n">coords</span> <span class="ow">in</span> <span class="n">vertex_coord_iter</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">vertex</span><span class="o">.</span><span class="n">label</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
                <span class="k">continue</span>

            <span class="n">label_size</span> 