Iterate through __slots__

[deanhystad]

I have a class that uses slots (not the class shown below). The class has a generator that iterates through the attributes and returns those of a certain type.

class AClass:
    __slots__ = ('a', 'b', 'c')

    def __init__(self, a, b, c):
        super().__init__()
        self.a = a
        self.b = b
        self.c = c

    def numbers(self):
        for attr in self.__slots__:
            value = getattr(self, attr)
            if type(value) in (int, float):
                yield value

class BClass:
    def __init__(self, a, b, c):
        super().__init__()
        self.a = a
        self.b = b
        self.c = c

    def numbers(self):
        for value in self.__dict__.values():
            if type(value) in (int, float):
                yield value

class CClass(AClass):
    __slots__ = ('d', 'e')

    def __init__(self, a, b, c, d, e):
        super().__init__(a, b, c)
        self.d = d
        self.e = e

a = AClass('Word', 123, ('a','tuple'))
b = BClass('Word', 123, ('a','tuple'))
c = CClass('Word', 123, ('a','tuple'), 5.2, [1, 2, 3])

for number in a.numbers(): print('a contains', number)
for number in b.numbers(): print('b contains', number)
for number in c.numbers(): print('c contains', number)

I like the way BClass.numbers skips the step of using the key to get the value. All I care about are the values. But I cannot figure out how to do this with slots. I again get the feeling that there's something I am missing?

I know I should only ask one question at a time, but this is so closely related..

I have a class (CClass above) that inherits from my base class (AClass). When I search for numbers it unsurprisingly only finds the numbers in the slots added by CClass. I would like to find the numbers from the AClass slots too.

I did play around with using the mro. That works but is ugly. I tried using dir(), but that searches all the attributes up to class object. I tried having numbers call super(), but that didn't work and wasn't what I wanted anyway. I would like CClass to execute numbers using his superclass's slots (call same method wit supers' class data), not call the superclass's method with my slots.