Can you create an instance of a subclass with an existing instance of the base class?

[Lawrence D'Oliveiro]

In article <1145736124.831082.34550 at v46g2000cwv.googlegroups.com>,
 "Sandra-24" <sandravandale at yahoo.com> wrote:

>Now that is a clever little trick. I never would have guessed you can
>assign to __class__, Python always surprises me in it's sheer
>flexibility.

That's because you're still thinking in OO terms.