n><span class="o">.</span><span class="n">set_config</span><span class="p">(</span><span class="n">theme</span><span class="o">=</span><span class="s1">&#39;solar&#39;</span><span class="p">)</span>
  <span class="n">df</span> <span class="o">=</span> <span class="kc">None</span>
  <span class="n">f_name</span> <span class="o">=</span> <span class="kc">None</span>
  <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">