   <span class="n">_lno</span> <span class="o">=</span> <span class="mi">0</span>
    <span class="n">_Database</span> <span class="o">=</span> <span class="p">[]</span>

    <span class="k">def</span> <span class="nf">_convert</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Union</span><span class="p">[</span><span class="nb">int</span><span class="p">,</span> <span class="nb