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练习

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浅言87780

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class Student(object):

    def __init__(self, name, score):

        self.name = name

        self.score = score

    def get_grade(self):

        if self.score not in range(0,101):

            raise ValueError('invalid value:%d'%self.score)

        if self.score >= 80:

            return 'A'

        elif self.score >= 60:

            return 'B'

        else:

            return 'C'


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