回测使用指数数据，下单实盘下在具体合约，请问指数合约如何获得？

<span class="n">klines</span> <span class="o">=</span> <span class="n">api</span><span class="o">.</span><span class="n">get_kline_serial</span><span class="p">(</span><span class="s2">"KQ.i@SHFE.rb"</span><span class="p">,</span> 5*60<span class="p">)</span>

请问这么写代码，可以吗？