访问基本（父）class 方法中的 class 属性，派生（子）classes 可能重载

Question

我正在尝试在父 class 中创建一个函数，该函数引用子 class 最终调用它以获得子 [=21= 中的静态变量].

这是我的代码。

class Element:
  attributes = []

  def attributes_to_string():
    # do some stuff
    return ' | '.join(__class__.attributes) # <== This is where I need to fix the code.

class Car(Element):
  attributes = ['door', 'window', 'engine']

class House(Element):
  attributes = ['door', 'window', 'lights', 'table']

class Computer(Element):
  attributes = ['screen', 'ram', 'video card', 'ssd']

print(Computer.attributes_to_string())

### screen | ram | video card | ssd

如果它是使用 self.__class__ 的 class 实例，我知道我会怎么做，但在这种情况下没有 self 可供参考。

Answer 1

decorating with classmethod 应该有效

class Element:
    attributes = []

    @classmethod
    def attributes_to_string(cls):
        # do some stuff
        return ' | '.join(cls.attributes)


class Car(Element):
    attributes = ['door', 'window', 'engine']


class House(Element):
    attributes = ['door', 'window', 'lights', 'table']


class Computer(Element):
    attributes = ['screen', 'ram', 'video card', 'ssd']


print(Computer.attributes_to_string())

给我们

screen | ram | video card | ssd

访问基本（父）class 方法中的 class 属性，派生（子）classes 可能重载

Accessing class attributes in base (parent) class method with possible overloading by derived (children) classes

python

class

parent-child

static-variables

static-classes