="n">pre_idxs</span><span class="p">):</span>
            <span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;    → </span><span class="si">{</span><span class="n">idx</span><span class="p">[</span><span class="n">pi</span><span class="p">]</span><span class="si">}</span><span class="s2"> : </span><span class="si">{</span><span class="n">s</span><span class="o">.</span><span class="n">iloc</span><span class="p">[</span><span class="n">pi</span><span class="