[Python] Statically get all attributes of class

I want to be able to call a static method of a class (or classmethod) to only get the attributes of that class. By the attributes of the class, I mean the ones that are set in the constructor of the class. I also use inheritance, so I would like to be able to do this for both MyClass and MyChildClass.

class MyClass():
def __init__(self, x = None, y = None):
self.a = x
self.b = y

@classmethod
def get_all_attr(cls):
return ?

class MyChildClass():
def __init__(self, z = None, **kwargs):
self.c = z
super().__init__(**kwargs)

>>> MyClass.get_all_attr()
['a', 'b']
>>> MyChildClass.get_all_attr()
['c', 'a', 'b']



I know that __dir__() exists, but I have not been able to call this statically. I've also tried MyClass.__dict__().keys(), but this also won't work.

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