factories.py

class Base:
    version = "unknown"
    code = "unknown"

    @classmethod
    def identifier(cls):
        return cls.code + '/' + cls.version

    def do(self):
        print("I'm a stupid method in the base class")


class SmartV1(Base):
    version = 'v1'
    code = 'smart'

    def do(self):
        print("I'm a terribly named method in the smart v1 class")
        print("I identify myself as " + self.identifier())


class DumbV2(Base):
    version = 'v2'
    code = 'dumb'

    def do(self):
        print("Also terriblee noumed mefot, but I R smat")
        print("There people call I " + self.identifier())


class Factory:
    """Because classes, that's why."""

    available_results = [SmartV1, DumbV2]

    @classmethod
    def create_code(cls, code):
        for klass in cls.available_results:
            if klass.identifier() == code:
                return klass()
        return None


def main():
    """This is just an example."""
    obj = Factory.create_code('smart/v1')
    obj.do()

    obj = Factory.create_code('dumb/v2')
    obj.do()

if __name__ == "__main__":
    main()