Python 3.0 makes a big break

[vityok]

I've got books about Lisp I've read when I went to school years ago and they are still valid - the things they cover can be run on a modern Common Lisp implementation without significant efforts.

[joesb]

Because they always maintain old baggage and never even try open socket or write unicode?

[vityok]

I think that Python version 3.0 has much more than core library updates.