CODEWITHSUNDEEP
pythonpython-3.xinheritanceabstract-class
myol
myol

Reputation: 9878

Inheritence with abstract methods and attributes

Is it possible for an inherited class to call a parents abstract method which refers to the child class without knowing the child class in advance?

class AbsParent(object):
    att = 'parent'

    def my_meth():
        return AbsParent.att

class AbsChild(AbsParent):
    att = 'child'

print(AbsChild.my_meth())

Obviously the code above will always return parent since the parent class is calling its own attribute via AbsParenet.att

Is there a clean way the child class can use the Parent class method using inheritance but still reference its own attribute to print child? I can only think of something horrible like this

 class AbsParent(object):
     att = 'parent'

     def my_meth(abs_class):
          return abs_class.att

 class AbsChild(AbsParent):
    att = 'child'

print(AbsChild.my_meth(AbsChild))

Upvotes: 1

Views: 41

Answers (1)

Mark
Mark

Reputation: 92461

It's not super clear whether you indend my_meth to be a class method or not. You're calling with the class AbsChild so maybe you want something like:

class AbsParent(object):
    att = 'parent'
    @classmethod
    def my_meth(cls):
        return cls.att

class AbsChild(AbsParent):
    att = 'child'

print(AbsChild.my_meth())

Alternatively for an instance method:

class AbsParent(object):
    att = 'parent'

    def my_meth(self):
        return self.att

class AbsChild(AbsParent):
    att = 'child'

c = AbsChild() # make instance

print(c.my_meth())

both print child

Upvotes: 2

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