如何将多个数据框合并到一个多索引数据框，其中每个合并的数据框都成为第二级列

Question

我想要实现的（没有太多混乱）是合并 3 个不同的数据帧，每个数据帧具有相同的列和索引，但每个代表不同的类别。

df1

                                    Children    Movie enthusiast
household       
06f32e6e45da385834dac983256d59f3    0.086158    NaN
0d1974107c6731989c762e96def73568    0.120285    0.187764
0fd4f3b4adf43682f08e693a905b7432    0.400000    0.114686
11e0057cdc8b8e1b1cdabfa8a092ea5f    NaN         0.140000
120549af6977623bd01d77135a91a523    0.335238    0.192578

df2

                                    Children    Movie enthusiast
household       
06f32e6e45da385834dac983256d59f3    1.0         0.0
0d1974107c6731989c762e96def73568    4.0         11.0
0fd4f3b4adf43682f08e693a905b7432    1.0         5.0
11e0057cdc8b8e1b1cdabfa8a092ea5f    0.0         2.0
120549af6977623bd01d77135a91a523    7.0         9.0

df3

                                    Children    Movie enthusiast
household       
06f32e6e45da385834dac983256d59f3    nan         nan
0d1974107c6731989c762e96def73568    0.138       0.037
0fd4f3b4adf43682f08e693a905b7432    nan         0.025
11e0057cdc8b8e1b1cdabfa8a092ea5f    nan         0.153
120549af6977623bd01d77135a91a523    0.091       0.021

df_merged（手动填充，因此并非所有值都存在，但您明白了）

                                    Children                Movie enthusiast
                                    df1      df2    df3     df1      df2    df3
household                       
06f32e6e45da385834dac983256d59f3    0.086158 1      NaN     NaN      NaN    NaN
0d1974107c6731989c762e96def73568    0.120285 4      0.138   0.187764 NaN    NaN
0fd4f3b4adf43682f08e693a905b7432    0.400000 1      NaN     0.114686 NaN    NaN
11e0057cdc8b8e1b1cdabfa8a092ea5f    NaN      0      NaN     0.140000 NaN    NaN
120549af6977623bd01d77135a91a523    0.335238 7      0.091   0.192578 NaN    NaN

Answer 1

我认为您需要 concat with parameter keys, then swaplevel with sort_index 以获得所需的格式 MultiIndex:

df = pd.concat([df1, df2, df3], keys=['df1','df2','df3'], axis=1)
       .swaplevel(0,1,axis=1)
       .sort_index(axis=1)
print (df)

                                  Children             Movie enthusiast  \
                                       df1  df2    df3              df1   
06f32e6e45da385834dac983256d59f3  0.086158  1.0    NaN              NaN   
0d1974107c6731989c762e96def73568  0.120285  4.0  0.138         0.187764   
0fd4f3b4adf43682f08e693a905b7432  0.400000  1.0    NaN         0.114686   
11e0057cdc8b8e1b1cdabfa8a092ea5f       NaN  0.0    NaN         0.140000   
120549af6977623bd01d77135a91a523  0.335238  7.0  0.091         0.192578   
household                              NaN  NaN    NaN              NaN   

                                        Movie enthusiastnthusiast  
                                    df3                       df2  
06f32e6e45da385834dac983256d59f3    NaN                      0.00  
0d1974107c6731989c762e96def73568  0.037                     11.00  
0fd4f3b4adf43682f08e693a905b7432  0.025                      5.00  
11e0057cdc8b8e1b1cdabfa8a092ea5f  0.153                      2.00  
120549af6977623bd01d77135a91a523  0.021                      9.01  
household                           NaN                       NaN

如何将多个数据框合并到一个多索引数据框，其中每个合并的数据框都成为第二级列

how to merge mulitple dataframes to one multiindex dataframe where each of merged dataframes becomes 2nd level column

python

merge

multi-index

dataframe

pandas