     <span class="sd">&quot;&quot;&quot;Override for isinstance(instance, cls).&quot;&quot;&quot;</span>
            <span class="k">return</span> <span class="n">_abc_instancecheck</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">instance</span><span class="p">)</span>

        <span class="k">def</span> <span class="fm">__subclasscheck__</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">subclass</span><span cl