v class="input_area">
<div class=" highlight hl-ipython3"><pre><span></span><span class="n">df</span> <span class="o">=</span> <span class="n">generate_db</span><span class="p">(</span><span class="n">cols</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;c1&#39;</span><span class="p">,</span> <span class="s1">&#39;c2&#39;</span><span class="p">,</span> <span class="s1">&#39;c3&#39;</span><span class="p">])</span>
<span class="n">df</span><span class="o">.</span><span class="n">hea