Python nested classes inheritance

Question

I have a quiestion on generating classes in Python with type() function

class A:
    class B:
        some_field = some_value

object received with A constructor call is as follows:

a = <__main__.A object at 0x040BF730>
    B = <class '__main__.A.B'>
        some_field = 0

Then I tried to make the same class with type() function

C = type("C", (), { 'D': type('D', (), {'some_field': int()})})

Object received with C constructor call contains D which is not inherited from C obviously:

c = <__main__.C object at 0x040BF930>
    D = <class '__main__.D'>
        some_field = 0

Is there a method to make the same structure as A() with factory function?