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小作业

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#1 Created at ... [Delete] [Delete and Lock User]

import unittest

class Student(object):

    def __init__(self, name, score):

        self.name = name

        self.score = score

    def get_grade(self):

        if self.score<0 or self.score>100:

            raise ValueError

        elif self.score >= 80:

            return 'A'

        elif self.score>=60:

            return 'B'

        else:

            return 'C'


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