python @property 设置只读属性 重写 getter setter 方法

@property NSString * name;

s.name = "xiaoming"

print(s.name);

>>> xiaoming

- (NSString*)name {
    return _name;
}

- (void)setName:(NSString *)name {
    // 此处可以对name做一些校验和处理
    _name = name
}

class Student(object):

    # get 方法采用 @property 修饰
    @property
    def score(self):
        return self._score

    # set 方法采用 属性名称.setter 修饰
    @score.setter
    def score(self, value):

        if not isinstance(value, int):
            raise ValueError('score must be integer!')

        if value < 0 or value > 100:
            raise ValueError('score must between 0 - 100!')
        self._score = value

s = Student()

s.score = 100

print(s.score)

class Frame(object):
    __slots__ = ('x', 'y', 'width', 'height')

    @property
    def size(self):
        return (self.width, self.height);

f = Frame()

f.x = 0

f.y = 0

f.width = 100

f.height = 200

print(f.size)

>>> (100, 200)