题解 | #牛牛的绩点#

from dataclasses import make_dataclass
a=[]
b=[]
i=0
under=0
score=[]
total=0
while True:
    temp=input()
    if temp=='False':
        break
    else:
        if i%2==0:
            a.append(temp)
        else:
            b.append(int(temp))
    i+=1
m=0
for i in a:
    if i=='A':
        score.append(4*b[m])
        under+=b[m]
        m+=1
    elif i=='B':
        score.append(3*b[m])
        under+=b[m]
        m+=1
    elif i=='C':
        score.append(2*b[m])
        under+=b[m]
        m+=1
    elif i=='D':
        score.append(1*b[m])
        under+=b[m]
        m+=1
    else:
        score.append(0*b[m])
        under+=b[m]
        m+=1
#print(a,b,sep='\n')
##print(score)
for i in score:
    total+=i
#print(total)
#print(under)
print(f'{(total/under):.2f}')
#print('%.2f'%(total/under))

最愚笨的方法