Nice article, but one thing struck me when reading the code examples posted in the article: What's the use of using kwds in __init__?

    class Shape(Root):
        def __init__(self, **kwds):
            self.shapename = kwds.pop('shapename')
            super().__init__(**kwds)

    class ColoredShape(Shape):
        def __init__(self, **kwds):
            self.color = kwds.pop('color')
            super().__init__(**kwds)

I would personally just have written this somewhat similar to this:

    class Shape(Root):
        def __init__(self, shapename):
            self.shapename = shapename
            super().__init__()

    class ColoredShape(Shape):
        def __init__(self, shapename, color):
            self.shapename = shapename
            self.color = color
            super().__init__(shapename)

But then again I'm by no means what anyone could call a Python 'Jedi'. Can anyone explain to me why using kwds in this way would be better? Would it not lead to having to look up the declaration of the class for the exact names of arguments to pop() every time?