="o">=</span> <span class="p">[(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">),</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">df</span><span class="p">),</span> <span class="mi">0</span><span class="p">),</span> <span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">df</span><span class="p">),</span> <span class="nb">len</span><span class="p">(</span><span class="n">df