class Student:
    def __init__(self, n, s):
        self.__name = n
        self.__score = s

    def get_name(self):
        return self.__name

    def set_score(self, s):
        self.__score = s

if __name__ == '__main__':
    stu = Student("Tom", 85)
    print(stu.get_name()) # ①
    stu.set_score(90) # ②
    print(stu.__score) # ③
    print(stu.get_name()) # ④