[Tutor] bug in exam score conversion program

[Brian C. Lane]

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David wrote:
> Hello!!
> 
> I just completed exercise 7 (chapter 4) in Zelle's book:
> "A certain CS professor gives 100-point exams that are graded on the
> scale 90–100:A, 80–89:B, 70–79:C, 60–69:D, 60:F. Write a program that
> accepts an exam score as input and prints out the corresponding grade."
> 

Just to throw in another method, I tend to use tables of for problems
like this. The requirements usually change so its easier to modify later:

# min, max, grade
grades = [  (90,100,'A'),
            (80, 89,'B'),
            (70, 79,'C'),
            (60, 69,'D'),
            ( 0, 59,'F'),
        ]

def getGrade(score):
    """
    Return a letter grade based on a score
    """
    for g in grades:
        if (score <= g[1]) and (score >= g[0]):
            return g[2]



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