將數據從一個表映射到另一個表？

Question

我有一張表，其中主扇區作為具有不同條目的一列。 我需要再增加一列作為主要部門。 主要扇區將從映射表中選取。 如何完成這項任務。

樣本數據

Primary Sector    Major Sector
Skating
Painting
Engineer
Running
Gardening
Administrator
tennis
Reading
Cricket
Accountant

映射表

                 Job     Hobby         Sports
Skating            0         0              1
Painting           0         1              0
Engineer           1         0              0
Running            0         0              1
Gardening          0         1              0
Administrator      1         0              0
tennis             0         0              1
Reading            0         1              0
Cricket            0         0              1
Accountant         1         0              0

Answer 1

將參數axis=1 map與idxmax一起按idxmax使用：

df1['Major Sector'] = df1['Primary Sector'].map(df2.idxmax(axis=1))

print(df1)
  Primary Sector Major Sector
0        Skating       Sports
1       Painting        Hobby
2       Engineer          Job
3        Running       Sports
4      Gardening        Hobby
5  Administrator          Job
6         tennis       Sports
7        Reading        Hobby
8        Cricket       Sports
9     Accountant          Job

---

print(df2.idxmax(axis=1))

Skating          Sports
Painting          Hobby
Engineer            Job
Running          Sports
Gardening         Hobby
Administrator       Job
tennis           Sports
Reading           Hobby
Cricket          Sports
Accountant          Job
dtype: object