     <span class="bp">self</span><span class="o">.</span><span class="n">_df</span> <span class="o">=</span> <span class="n">df</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_threshold</span> <span class="o">=</span> <span class="nb">int</span><span class="p">(</span><span class="n">threshold</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_items</span> <span class="o">=</span> <span class="p">[]</span>
        <