t;&quot;&quot;</span>

    <span class="k">assert</span> <span class="nb">type</span><span class="p">(</span><span class="n">required_columns</span><span class="p">)</span> <span class="o">==</span> <span class="nb">set</span>
    <span class="k">assert</span> <span class="nb">issubclass</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">executor</span><span class="p">),</span> <span class="n">Executor</span><span class="p">),</span> <span class="s2">&quot;user