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练习

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何苦来哉ooo

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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('the score must less than 100 or more than 0')
    if self.score>=80:
        return 'A'
    elif self.score>=60:
        return 'B'
    else:
        return 'C'
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