
        <span class="k">if</span> <span class="ow">not</span> <span class="n">v</span><span class="p">:</span>
            <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'Unknown variant'</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">_active_variant</span> <span class="o">=</span> <span class="n">v</span>

    <span class="nd">@property</span>
    <span class="k">def</span><span class="w"> 