span>
<span class="sd">            Represent the existential probability(likelihood presence) of an item</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">item</span><span class="p">,</span> <span class="n">probability</span><span class="p">):</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">item</span> <span class=