The new edition of my book, titled The Python 3 Standard Library By Example, will be available soon. Owners of the previous edition, based on Python 2, can receive a discount on the new edition by registering their copies with the publisher.
Visit informit.com/register before 2 May to create an account and register your old edition, regardless of where you purchased it. Note that you’ll need to agree to receive promotional email from them, since that’s how the discount information will be delivered.
After you’ve registered, look for information about the discount to be delivered on 5 May.