How can I call a subclass method from parent class ?

[Jason Lai]

If you use a newstyle class, e.g. class A(object), then you can get the
superclass with cls.__base__. You could also use super(cls,cls),
although note that it returns a <super> object that isn't exactly the
same thing as a class -- but good enough for just accessing attributes.

Make sure to check that your superclass isn't <object>, otherwise it'll
complain about <object> not having a foo attribute. __base__ is
probably easier for this purpose. Also be careful with multiple
inheritance.

No such thing as __super though.