n class="nd">@method2members</span>
  <span class="k">def</span> <span class="nf">__neg__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">pass</span>

<span class="c">#    &quot;&quot;&quot;</span>
<span class="c">#    Call __neg__ on members and return corresponding Membered object.</span>
<span class="c">#    &quot;&quot;&quot;</span>
<span class="c">#    return self.__class__( [-member for member in self] )</span>

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