span class="n">label</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">key</span> <span class="o">=</span> <span class="n">label</span>

        <span class="bp">self</span><span class="o">.</span><span class="n">labels</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">vertex</span></div>


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