define aggfunc for each values column in pandas pivot table

Question

Was trying to generate a pivot table with multiple \"values\" columns. I know I can use aggfunc to aggregate values the way I want to, but what if I don\'t want to sum or avg bo

Answer 1

You can concat two DataFrames:

>>> df1 = pd.pivot_table(df, values=['D'], rows=['B'], aggfunc=np.sum)
>>> df2 = pd.pivot_table(df, values=['E'], rows=['B'], aggfunc=np.mean)
>>> pd.concat((df1, df2), axis=1)
          D         E
B                    
A  1.810847 -0.524178
B  2.762190 -0.443031
C  0.867519  0.078460

or you can pass list of functions as aggfunc parameter and then reindex:

>>> df3 = pd.pivot_table(df, values=['D','E'], rows=['B'], aggfunc=[np.sum, np.mean])
>>> df3
        sum                mean          
          D         E         D         E
B                                        
A  1.810847 -4.193425  0.226356 -0.524178
B  2.762190 -3.544245  0.345274 -0.443031
C  0.867519  0.627677  0.108440  0.078460
>>> df3 = df3.ix[:, [('sum', 'D'), ('mean','E')]]
>>> df3.columns = ['D', 'E']
>>> df3
          D         E
B                    
A  1.810847 -0.524178
B  2.762190 -0.443031
C  0.867519  0.078460

Alghouth, it would be nice to have an option to defin aggfunc for each column individually. Don't know how it could be done, may be pass into aggfunc dict-like parameter, like {'D':np.mean, 'E':np.sum}.

update Actually, in your case you can pivot by hand:

>>> df.groupby('B').aggregate({'D':np.sum, 'E':np.mean})
          E         D
B                    
A -0.524178  1.810847
B -0.443031  2.762190
C  0.078460  0.867519

Answer 2

You can apply a specific function to a specific column by passing in a dict.

pd.pivot_table(df, values=['D','E'], rows=['B'], aggfunc={'D':np.sum, 'E':np.mean})

Answer 3

table = pivot_table(df, values=['D', 'E'], index=['A', 'C'],
                aggfunc={'D': np.mean,'E': np.sum})

table D E mean sum A C bar large 5.500000 7.500000 small 5.500000 8.500000 foo large 2.000000 4.500000 small 2.333333 4.333333