Question

我在multindex数据帧上交换级别，当交换发生时，我希望合并级别中的“ like”条目。

我尝试了一个简单的dataframe.swap（i，j）并交换了它们，但它不执行我想要的合并。

import pandas as pd

idx2 = pd.MultiIndex.from_tuples([("A5",6),("A5",1), ("A2",2),("A2",1),("A3",1),("A3",2), ("A4",4),("A4",1), ("A1",1),("A1",2)],
                                 names = ['first','second'])

df2 = pd.DataFrame({"A":[10, 11, 7, 8, 5,1,2,3,4,5],  
                    "B":[21, 5, 32, 4, 6,1,2,3,4,5],  
                    "C":[11, 21, 23, 7, 9,1,2,3,4,5],  
                    "D":[1, 5, 3, 8, 6,1,2,3,4,5]},  
                    index = idx2)

df2

               A   B   C  D
first second
A5    6       10  21  11  1
      1       11   5  21  5
A2    2        7  32  23  3
      1        8   4   7  8
A3    1        5   6   9  6
      2        1   1   1  1
A4    4        2   2   2  2
      1        3   3   3  3
A1    1        4   4   4  4
      2        5   5   5  5

df2.swap(0,1)

               A   B   C  D
second first
6      A5     10  21  11  1
1      A5     11   5  21  5
2      A2      7  32  23  3
1      A2      8   4   7  8
       A3      5   6   9  6
2      A3      1   1   1  1
4      A4      2   2   2  2
1      A4      3   3   3  3
       A1      4   4   4  4
2      A1      5   5   5  5

我想要

df2.swaplevel(0,1)

               A   B   C  D
second first
1      A1      4   4   4  4
       A2      8   4   7  8
       A3      5   6   9  6       
       A4      3   3   3  3
       A5     11   5  21  5
2      A1      5   5   5  5
2      A2      7  32  23  3
2      A3      1   1   1  1
4      A4      2   2   2  2
6      A5     10  21  11  1

合并交换级别熊猫上的条目

0 个答案: