class Person(object):

    def __init__(self, name, score):
        self.name=name
        self.__score=score

    def get_grade(self):#目的是访问私有成员
        return self.__score

p1 = Person('Bob', 90)
p2 = Person('Alice', 65)
p3 = Person('Tim', 48)

print(p1.get_grade())
print(p2.get_grade())
print(p3.get_grade())
