failing to instantiate an inner class because of order of inner classes

[Pyenos]

class model:pass
class view:
        model()
class controller:
        model()

I can instantiate clsss model from inside class view but I can't
instantiate class model from inside controller, due to the nature of
python interpreter.

I wish to circumvent this restriction by:

class model:pass
class view:
        parent_class.model()
class controller:
        parent_class.model()

but, I don't know the built-in variable that points to the parent
class. Could someone tell me how can I instantiate class model from
inside controller AND instantiate class model from inside view?