题解 | #牛牛的绩点#
牛牛的绩点
https://www.nowcoder.com/practice/de8bc3e736164786b07a4dd64ed172f7
score = {'A':4.0, 'B':3.0, 'C':2.0, 'D':1.0, 'F':0}
niu_score = {}
score_sum = 0
credit_sum = 0
flag = str(input())
while flag != 'False':
assert flag in score.keys()
credit = float(input())
score_sum += credit * score[flag]
credit_sum += credit
flag = str(input())
print(f'{score_sum / credit_sum:.2f}')
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