   <span class="n">name</span> <span class="o">=</span> <span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">index</span><span class="p">)</span> <span class="k">if</span> <span class="n">feature_names</span> <span class="ow">is</span> <span class="kc">None</span> <span class="k">else</span> <span class="n">feature_names</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">index</span><span class="