题解 | #牛牛的绩点#
牛牛的绩点
https://www.nowcoder.com/practice/de8bc3e736164786b07a4dd64ed172f7
dict1 = {"A": 4.0, "B": 3.0, "C": 2.0, "D": 1.0, "F": 0}
b = []
d = []
while True:
a = input()
if a == 'False':
break
else:
c = int(input())
b.append(dict1[a] * c)
d.append(c)
avg = sum(b) / sum(d)
print('%.2f' % avg)
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