python索引问题

Question

编写程序，已知成绩列表s={‘小李’：【77，54，57】，‘小张’：【89，66，78】}。输出结果为{‘小李’：62，‘小张’：77}
这个是运用索引找吗，麻烦写一下流程

Answer 1

s={'小李':[77,54,57],'小张':[89,66,78]}
a = []
for i in s.values():
    a.append((sum(i)/len(i))//1)
b = 0
for i in s.keys():
    s[i] = a[b]
    b+=1
print(s)