lass="k">return</span> <span class="n">res</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="k">raise</span> <span class="ne">AttributeError</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;This parestimate object does not have group with name &#39;</span><span class="si">{</span><span class="n">item</span><span class="si">}</span><span class="s2">&#39;.&quot;</span><span class="p">)</span>

    <span class="k">def</span> <span c