[Python] Do I have to define attributes in the base class in Python?

This is kind of a "best practices" question, but my IDE is throwing a warning at me when I commit my code, and I'm not sure how to proceed.

"Unresolved attribute reference "attribute" for class "BaseClass".
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Essentially I have a base class, with get and set methods.

class BaseClass(object):
def __set__(self, obj, value):
foo = obj.bar
foo.findmethod(self.attribute).setmethod(value)


Then, I inherit from this class when using actual classes I will use:

class ChildClass1(BaseClass):
attribute = this

class ChildClass2(BaseClass):
attribute = that


As I will never use the base class directly, I don't see a reason to define this attribute at that level. But the warning makes me wonder if this is bad practice.

Apologies if my naming convention is confusing.

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