How to access class attributes of a derived class in the base class in Python3?

Question

I want to do something in a base class (FooBase) with the class attribues of the derived classes (Foo). I want to do this with Python3.

class BaseFoo:
   #felder = [] doesn't work

   def test():
      print(__class__.felder)

class Foo(BaseFoo):
   felder = ['eins', 'zwei', 'yep']


if __name__ ==  '__main__':
    Foo.test()

Maybe there is a different approach to this?

Something's very wrong here. Is test supposed to be a class method or an instance method? It must at the very least accept either cls or self as argument. — deceze
– deceze ♦, Commented Jul 29, 2016 at 9:56

PM 2Ring · Accepted Answer · 2016-07-29 10:15:01Z

1

You need to make test a class method, and give it an argument that it can use to access the class; conventionally this arg is named cls.

class BaseFoo:
    @classmethod
    def test(cls):
        print(cls.felder)

class Foo(BaseFoo):
    felder = ['eins', 'zwei', 'yep']


if __name__ ==  '__main__':
    Foo.test()

output

['eins', 'zwei', 'yep']

answered Jul 29, 2016 at 10:15

PM 2Ring

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