class A:
__slots__ = ("a",)
def __init__(self) -> None:
self.a = 1
class B1:
__slots__ = ("b",)
def __init__(self, b) -> None:
self.b = b
def __getattr__(self, k):
return getattr(self.b, k)
def __setattr__(self, k, v):
setattr(self.b, k, v)
class B2:
__slots__ = ("b",)
def __init__(self, b) -> None:
self.b = b
def __getattr__(self, k):
return getattr(super().__getattr__("b"), k)
def __setattr__(self, k, v):
setattr(super().__getattr__("b"), k, v)
class B3:
__slots__ = ("b",)
def __init__(self, b) -> None:
self.b = b
def __getattr__(self, k):
return getattr(getattr(super(), "b"), k)
def __setattr__(self, k, v):
setattr(getattr(super(), "b"), k, v)
a = A()
b = B1(a)
print(b.a) # RecursionError: maximum recursion depth exceeded
b = B2(a)
print(b.a) # AttributeError: 'super' object has no attribute '__getattr__'
b = B3(a)
print(b.a) # AttributeError: 'super' object has no attribute 'b'