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作业

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class Student(object):
    def __init__(self, name, gender):
        self.name = name
        self.__gender = gender
    def get_gender(self):
        return self.__gender
    def set_gender(self, gender):
        if gender==self.__gender:
            raise ValueError('gender no change')
        elif gender=='male' or gender=='female':
            self.__gender = gender
        else:
            raise ValueError('wrong gender')

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