In Pandas, after groupby the grouped column is gone

Question

I have the following dataframe named ttm:

    usersidid   clienthostid    eventSumTotal   LoginDaysSum    score
0       12          1               60                


        

Answer 1

You simply need this instead:

ttm.groupby(['clienthostid'], as_index=False, sort=False)[['LoginDaysSum']].apply(lambda x: x.iloc[0] / x.iloc[1]).reset_index()

The double [[]] will turn the output into a pd.Dataframe instead of a pd.Series.