pyhton之如何将类的属性和方法设置成私有类型

class Student:
    def __init__(self,name,age):
        self.name = name
        self.age = age
    def __printStudent(self):
        print("姓名是：",self.name)
        print("年龄是：",self.age)
stu = Student("tom",12)
#当将printStudent设置成私有的方法时
#再去在类外访问该方法就会报错
stu.printStudent()

stu._Student__printStudent()