"n">metaclass</span><span class="o">=</span><span class="n">ABCMeta</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;Helper class that provides a standard way to create an ABC using</span>
<span class="sd">    inheritance.</span>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="vm">__slots__</span> <span class="o">=</span> <span class="p">()</span>
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