an class="n">np</span><span class="o">.</span><span class="n">asarray</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">obj</span><span class="o">.</span><span class="n">rx</span><span class="p">(</span><span class="s2">&quot;rates&quot;</span><span class="p">)[</span><span class="mi">0</span><span class="p">])</span>

    <span class="k">def</span> <span class="fm">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> 