pan class="sig-name descname"><span class="pre">add_item</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">vector</span></span><span class="p"><span class="pre">:</span></span><span class="w"> </span><span class="n"><span class="pre">ndarray</span><span class="p"><span class="pre">[</span></span><span class="pre">Any</span><span class="p"><span class="pre">,</span></span><span class="w"> </span><span class="pre">dtype</span><span class="p"><span class="pre"