calculate_grade

def calculate_grade(score, maximum=100):
    """
    This function returns the grade of score.

    score := score in points
    maximum := maximum possible score

    The score are normalized internally to 100.
    """

    score /= maximum
    score *= 100
    print(score)
    grades_100 = {
        93: "A", 90: "A-",
        87: "B+", 83: "B", 80: "B-",
        77: "C+", 73: "C", 70: "C-",
        67: "D+", 63: "D", 60: "D-",
        }
    for min_score, grade in grades_100.items():
        if score >= min_score:
            return grade
    else:
        return "F"