题解 | #牛牛的绩点#
牛牛的绩点
https://www.nowcoder.com/practice/de8bc3e736164786b07a4dd64ed172f7
dic={'A':4.0,'B':3.0,'C':2.0,'D':1.0,'F':0}
sum1=0
tmp=0
while True:
grade=input()
if grade=='False':
break
else:
scores=int(input())
sum1+=dic[grade]*scores
tmp+=scores
ave=format((sum1/tmp),'.2f')
print(ave)
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