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}
list1=[]
list2=[]
while True:
a=input()
if a=="False":
break
else:
b=int(input())
list1.append(dict1[a]*b)
list2.append(b)
avg=sum(list1)/sum(list2)
print("%.2f"%avg)
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