delegation

Using __setattr__ and __getattr__ for delegation with __slots__ without triggering infinite recursion Question: 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__ = …

Why aren't superclass __init__ methods automatically invoked? Question: Why did the Python designers decide that subclasses’ __init__() methods don’t automatically call the __init__() methods of their superclasses, as in some other languages? Is the Pythonic and recommended idiom really like the following? class Superclass(object): def __init__(self): print ‘Do something’ class Subclass(Superclass): def __init__(self): super(Subclass, self).__init__() …