No Getter & Setter ...

version_1.py

class Background(object):
    def __init__(self):
        self.color = "black"
        
    def handle(self, handler):
        handle.do(self)
        
        
class Handler(object):
    def do(self, object):
        object.color = "red"

version_2.py

class Background(object):
    def __init__(self):
        self.color = "black"
        
class RedBackground(Background):
    def __init__(self):
        super(RedBackground).__init__()
        self.color = "red"

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