Max value using idxmax

Question

I am trying to calculate the biggest difference between summer gold medal counts and winter gold medal counts relative to their total gold medal count. The problem is that

Answer 1

def answer_two():
    df2=pd.Series.max(df['Gold']-df['Gold.1'])
    df2=df[df['Gold']-df['Gold.1']==df2]

    return df2.index[0]
answer_two()