 <span class="n">sample_path_list</span><span class="o">.</span><span class="n">extend</span><span class="p">(</span><span class="n">paths</span><span class="p">)</span>
        <span class="n">sample_class_id_list</span><span class="o">.</span><span class="n">extend</span><span class="p">([</span><span class="n">classes</span><span class="o">.</span><span class="n">index</span><span class="p">(</span><span class="n">key</span><span class="p">)]</span> <span class="o">*</span> <span class="nb">len</span><sp