class="s2">&quot;data1.csv&quot;</span><span class="p">,</span> <span class="s2">&quot;data2.csv&quot;</span><span class="p">,</span> <span class="s2">&quot;data3.csv&quot;</span><span class="p">]</span>
<span class="n">total_lines</span> <span class="o">=</span> <span class="mi">0</span>

<span class="c1"># Initialize file system once (works in both execution modes)</span>
<span class="n">xy</span><span class="o">.</span><span class="n">eval</span><span class="p">(</span><span class="s2">&quot;$global.fs =