Upgrading an instance to a subclass

[Antoon Pardon]

I have a subclass of socket.

class Mysocket (socket):
   ...

But when I use the python library it will of course
just return an instance of socket, like the SocketServer
module.

So now I was wondering if it is somehow possible to
turn this instance into a Mysocket instance, either
by somehow changing the original instance or producing
a new instance that represents the same connection.

-- 
Antoon Pardon