点击上方“Deephub Imba”,关注公众号,好文章不错过 !搞过量化交易的人都清楚，测试策略的时候流程能有多乱：Pandas 管数据、Matplotlib 画图、Backtrader 跑回测，最后还要再用 Excel ...

This tells pandas to build a pivot table, using the "region" column as the index, and the small, large, and "extra large" ...

I've always liked the idea of math, but doing it by hand has been another matter. My mental CPU seems to go to 100% during hand calculation. Hand calculators are good but Python libraries are even ...