[Python-3000] Changing order of class creation

[Terry Reedy]

"Ian Bicking" <ianb at colorstudy.com> wrote in message 
news:444CF483.6030603 at colorstudy.com...
 metaclass using a couple rules.  Then it does:
>
>   X = metaclass('X', (base,), {'y': 'z'})
>
> What if instead it did:
>
>   X = metaclass('X', (base,))
>   X.y = 'z'

What if X is inmutable, or intended to be so, either by inheritance or by 
method overriding?

tjr