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_three():
    return ((df[(df['Gold']>0) & (df['Gold.1']>0 )]['Gold'] - df[(df['Gold']>0) & (df['Gold.1']>0 )]['Gold.1'])/df[(df['Gold']>0) & (df['Gold.1']>0 )]['Gold.2']).argmax()