Ya no será posible importar un módulo que no respete PEP 8
Aun podrás importar tu código antiguo añadiendo el sufijo "_noqa"
Ciclo de vida del desarrollo del software
Although I own the book, and I've read it twice, I felt it was too prescriptive – if you see (x), then you must do (y). Any programmer worth his or her salt should already be refactoring aggressively. It's so essential to the craft that if you have to read a book to understand how it works, you probably shouldn't be a programmer in the first place.
PyFFI: The Python File Format Interface