As for a supposed "Advanced Python" edition, it would be great to compile at least a list of topics that could be interesting. Some have been already mentioned in this thread, like:
Test Driven Development (TDD) may or may not be a fad. Regardless, one can always have testing in ones development work. That doesn't mean you're driven by the tests.
Edit: On second thought, I read your comment sloppily. I agree, testing in itself isn't an advanced topic and I'd recommend a section on some testing :-)
As for a supposed "Advanced Python" edition, it would be great to compile at least a list of topics that could be interesting. Some have been already mentioned in this thread, like:
I'd add: