        <span class="bp">self</span><span class="o">.</span><span class="n">_graph</span> <span class="o">=</span> <span class="n">graph</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_n</span> <span class="o">=</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_graph</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_operator</span> <span c