n class="p">],</span><span class="mi">0</span><span class="p">)</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">utility</span><span class="p">[</span><span class="n">transaction</span><span class="p">[</span><span class="n">i</span><span class="p">]]</span> <span class="o">+=</span> <span class="n">utilities</span><span class="p">[</span><span class="n">i</span><span class="p">]</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">leng