class Person:

  def __init__(self,name,age):
    self.name = name
    self.__age = age

  def say_age(self):
    print('我的年龄：',self.__age)

  def say_introduce(self):
    print('我的名字是{0}'.format(self.name))

class Student(Person):
  def __init__(self,name,age,score):
    Person.__init__(self,name,age)
    self.score = score

  def say_introduce(self):
    print('不是，我的名字叫做{0}'.format(self.name))

s = Student('Xujie',18,70)
s.say_age()
s.say_introduce()