简述Python面向对象中怎么实现只读属性? ？

class Circle:
    def __init__(self, radius):
        self._radius = radius  # 实际存储的私有属性

    @property
    def radius(self):
        return self._radius  # 只读属性

    # 没有 setter 方法，禁止修改属性

# 创建 Circle 类的对象
circle = Circle(10)

# 访问只读属性
print(circle.radius)  # 输出: 10

# 尝试修改只读属性会引发 AttributeError
# circle.radius = 20  # 会抛出错误: AttributeError: can't set attribute

class Person:
    def __init__(self, name):
        self._name = name  # 私有属性

    @property
    def name(self):
        return self._name  # 只读属性

person = Person("Alice")
print(person.name)  # 输出: Alice

class Rectangle:
    def __init__(self, width, height):
        self._width = width
        self._height = height

    @property
    def width(self):
        return self._width

    @property
    def height(self):
        return self._height

    # 注意没有 setter 方法，所以无法修改属性

rectangle = Rectangle(5, 10)
print(rectangle.width)  # 输出: 5

# 尝试修改属性时，会抛出 AttributeError
# rectangle.width = 20  # 会抛出错误: AttributeError: can't set attribute