I’d like to get the ePub version on iBooks but how would I get access to the extra materials? Videos etc?
If you message Zed or contact the support I am sure they will send you an email if you have a receipt of purchase of some sort to prove you bought the book.
Yes, you get the videos no matter how you buy the book. The publisher changed how things work, so if it’s a book before Learn Python 3 The Hard Way, then look at the end of the book for a page describing how. If it’s Learn Python 3 The Hard Way and later then look at the end of their preface.