Get all __slots__ of derived class
First of all, it's
class A(object): __slots__ = ('a',)class B(A): __slots__ = ('b',)Making a list that contains all elements contained by __slots__ of B or any of its parent classes would be:
from itertools import chainslots = chain.from_iterable(getattr(cls, '__slots__', []) for cls in B.__mro__)
You want to iterate through each class in the MRO:
class A(object): __slots__ = ('x', 'y') def __init__(self): for slots in [getattr(cls, '__slots__', []) for cls in type(self).__mro__]: for attr in slots: setattr(self, attr, None)You can see that this works as expected in the derived class:
class B(A): __slots__ = ('z',)>>> b = B()>>> b.x, b.y, b.z<<< (None, None, None)