(</span><span class="n">table</span><span class="p">,</span><span class="bp">self</span><span class="o">.</span><span class="n">timeSeriesCol</span><span class="p">,</span><span class="bp">self</span><span class="o">.</span><span class="n">mainCategoryCol</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">to_feather</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span><span class="n">expandCategory</span><span class="p">,</span><span class="n">expand