  <span class="bp">self</span><span class="o">.</span><span class="n">rUtils</span> <span class="o">=</span> <span class="n">rUtil</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">period</span> <span class="o">=</span> <span class="n">period</span>


<span class="k">class</span> <span class="nc">_Pair</span><span class="p">:</span>
<span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">    A class to store item name and quantity together.</sp