pandas pivot table default behaviour-CodePudding

I have a dataframe which looks like :

col1 col2      col3 col4 
   0    fst    4    7
   0    snd    5    8
   1    fst    6    9

I apply:

 pd.pivot_table(df, index='col1', columns='col2', aggfunc='count', fill_value=0.0)

output:

       col3        col4
       fst   snd   fst  snd
index 
0      1     1      1    1
1      1     0      1    0

Expected output:

       fst   snd 
index
0      1     1     
1      1     0

Why columns have multiindex?

CodePudding user response：

You need to add the values

out = pd.pivot_table(df, index='col1', columns='col2', values = 'col3',aggfunc='count', fill_value=0.0)

Also in your case ,do pd.crosstab

out = pd.crosstab(df.col1, df.col2)