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():
    diff=df['Gold']-df['Gold.1']
    relativegold = diff.abs()/df['Gold.2']
    df['relativegold']=relativegold
    x = df[(df['Gold.1']>0) &(df['Gold']>0) ]
    return x['relativegold'].idxmax(axis=0)

answer_three()