如何在类中动态创建属性

class MyClass:
    pass

obj = MyClass()
setattr(obj, 'attribute_name', 'attribute_value')
print(obj.attribute_name)  # 输出：attribute_value

class MyClass:
    @property
    def attribute_name(self):
        return self._attribute_name

    @attribute_name.setter
    def attribute_name(self, value):
        self._attribute_name = value

obj = MyClass()
obj.attribute_name = 'attribute_value'
print(obj.attribute_name)  # 输出：attribute_value

class MyClass:
    pass

obj = MyClass()
obj.__dict__['attribute_name'] = 'attribute_value'
print(obj.attribute_name)  # 输出：attribute_value