Chongqing University of Posts and Telecommunications Python Homework 4. GPA Calculation ---- (The third homework)

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Original title

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Code

credits = score = 0
gpa = [4.0,3.7,3.3,3.0,2.7,2.3,2.0,1.5,1.3,1.0,0];level = ['A','A-','B+','B','B-','C+','C','C-','D','D-','F']
while True:
    str = input()
    if(str == '-1'):break
    else:
        temp = float(input())
        score += temp*gpa[level.index(str)]
        credits += temp
print("%.2f" %(score/credits))

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The elegant code comes from the shock of the king of eggplant