apItemSum</span><span class="p">:</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">_mapItemSum</span><span class="p">[</span><span class="n">item</span><span class="p">]</span> <span class="o">+=</span> <span class="n">quantities</span><span class="p">[</span><span class="n">i</span><span class="p">]</span>
                <span class="k">else</span><span class="p">:</span>
                    <span class="bp">self</span><span class="o">.</span><span class="n">_