span>
        <span class="k">return</span> <span class="n">tidDict</span>

    <span class="k">def</span> <span class="nf">_calculateExpSup</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">tidList</span><span class="p">):</span>
<span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        This function is used to calculate support of tidList</span>
<span class="sd">        :param tidList: timestamp of a list.</span>
<sp