如何强制@property setter只工作一次？

def once_setter(func):
    def wrapper(self, value):
        if not hasattr(self, '_set_once'):
            setattr(self, '_set_once', True)
            return func(self, value)
        else:
            raise ValueError("Setter can only be called once.")
    return wrapper

class MyClass:
    @property
    def my_property(self):
        return self._my_property

    @my_property.setter
    @once_setter
    def my_property(self, value):
        self._my_property = value

# 示例用法
obj = MyClass()
obj.my_property = 10  # 第一次设置成功
print(obj.my_property)  # 输出: 10

obj.my_property = 20  # 第二次设置，抛出异常：ValueError: Setter can only be called once.