class Registry:
    def __init__(self):
        self.registered = {}
 
    def add(self, name):
        def decorator(function):
            self.registered[name] = function
            return function
        return decorator
 
    def __call__(self, name):
        return self.registered[name]
 
RegistryOne = Registry()
RegistryTwo = Registry()
 
@RegistryOne.add("the_one")
class Example1:
    def __init__(self, scale_factor=1):
        self.scale_factor = scale_factor
 
 
@RegistryOne.add("the_two")
class Example2:
    def __init__(self, scale_factor=2):
        self.scale_factor = scale_factor
 
 
if __name__ == "__main__":
    the_one = RegistryOne("the_one")()
    print(f"{the_one.scale_factor=}")
 
    assert RegistryOne.registered != RegistryTwo.registered

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