Turn Pandas Multi-Index into column

Question

I have a dataframe with 2 index levels:

                         value
Trial    measurement
    1              0        13
                   1         3
            


        

Answer 1

I ran into Karl's issue as well. I just found myself renaming the aggregated column then resetting the index.

df = pd.DataFrame(df.groupby(['arms', 'success'])['success'].sum()).rename(columns={'success':'sum'})

df = df.reset_index()