python字典推导式

Question

#已知有 scores = {'Reuven': [300, 250, 350, 400], 'Shikma':[250, 380, 420, 120], 'Amotz':[100, 120, 150, 180]}。使用字典推导式构造选手为键、平均分为值的字典。

Answer 1

{key: sum(scores[key])/len(scores[key]) for key in scores.keys()}