pandas dataframe groupby sum index

Question

I have a dataframe, I want to

    FROM:  
             dow    yield
           0    F   2
           1    F   3
           2    M   4
           3    M   6
         


        

Answer 1

First column is index, so you can add parameter as_index=False:

df1 = df.groupby('dow', as_index=False).sum()
print (df1)
  dow  yield
0   F      5
1   M     10
2  TH      7

Or reset_index:

df1 = df.groupby('dow').sum().reset_index()
print (df1)
  dow  yield
0   F      5
1   M     10
2  TH      7