如何按列值分组

Question

下面是我的数据：Dataframe -- df_AW17

Product ID  Season  Division    Brand   Category    Sub Category    AW16 (Sales)    AW17 (Sales)

Blazer 1    AW17    Men's Wear  Brand 1 Top BLAZER      198

Blazer 2    AW16    Men's Wear  Brand 1 Top BLAZER  138 

Blazer 2    AW17    Men's Wear  Brand 1 Top BLAZER      270

Blazer 3    AW17    Men's Wear  Brand 1 Top BLAZER      27

Blazer 4    AW17    Men's Wear  Brand 1 Top BLAZER      192

Blazer-10   AW17    Women's Wear    Brand 1 Top BLAZER      15

Blazer-11   AW16    Women's Wear    Brand 1 Top BLAZER  10  

Blazer-11   AW17    Women's Wear    Brand 1 Top BLAZER      14

Blazer-12   AW17    Women's Wear    Brand 1 Top BLAZER      16

Blazer-13   AW17    Women's Wear    Brand 1 Top BLAZER      207

Blazer-5    AW16    Women's Wear    Brand 1 Top BLAZER  126 

Blazer-5    AW17    Women's Wear    Brand 1 Top BLAZER      200

Blazer-6    AW17    Men's Wear  Brand 1 Top BLAZER      5

Blazer-7    AW17    Women's Wear    Brand 1 Top BLAZER      299

Blazer-8    AW17    Women's Wear    Brand 1 Top BLAZER      147

Blazer-9    AW17    Men's Wear  Brand 1 Top BLAZER      23

Jacket-10   AW17    Men's Wear  Brand 1 Top JACKETS     20

Jacket-11   AW17    Men's Wear  Brand 1 Top JACKETS     5

Jacket-12   AW16    Men's Wear  Brand 1 Top JACKETS 5   

Jacket-12   AW17    Men's Wear  Brand 1 Top JACKETS     12

Jacket-13   AW16    Women's Wear    Brand 1 Top JACKETS 15

它有 Product ID 作为值，我需要使用 Season AW16、AW17 以及给定的 AW16（Sales）、AW17（Sales）销售额来获得销售增长百分比作为新列。问题是我无法对公式进行分组或放置公式，因为销售的列值在特定产品 ID 的不同行中。

我曾尝试过。

df_AW17['Sales Growth %'] = df_AW17.groupby(['Product ID'])(((df_AW17['AW17 (Sales)'] - df_AW17['AW16 (Sales)']) / df_AW17['AW16 (Sales)']) * 100).

我想要的结果是（销售增长百分比）从 AW16（销售）到 AW17（销售）特定于产品 ID。

Answer 1

由于您的数据框中的所有行似乎都有唯一的产品 ID，因此创建新列之后更简单的方法是否不能满足目的？

df_AW17['Sales_growth_pct'] = (df_AW17['AW17 (Sales)'] - df_AW17['AW16 (Sales)']) / df_AW17['AW16 (Sales)']