lass="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">empty</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">col_order</span><span class="p">)),</span> <span class="n">columns</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;&#39;</span><span class="p">])</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">header</span> <span class="o">=</span> <span class="n">ann