使类变量在声明(运行时)后保持常量(使用某些类方法)

class MyClass:
    _CONSTANT = "This is a constant"

    @property
    def CONSTANT(self):
        return self._CONSTANT

# 使用
obj = MyClass()
print(obj.CONSTANT)  # 输出: This is a constant
obj.CONSTANT = "Try to change"  # 这将引发AttributeError

public class MyClass {
    public static final String CONSTANT = "This is a constant";

    public static void main(String[] args) {
        System.out.println(MyClass.CONSTANT);  // 输出: This is a constant
        // MyClass.CONSTANT = "Try to change";  // 这将导致编译错误
    }
}

class MyClass {
    static CONSTANT = "This is a constant";
}

console.log(MyClass.CONSTANT);  // 输出: This is a constant
MyClass.CONSTANT = "Try to change";  // 这将静默失败或抛出TypeError，取决于环境