Also, if using python 3.6+ need to change **vars(descr) to **descr._asdict()

Thank you both for this contribution. I have not yet started working on a 2nd edition of Fluent Python. Almost all the issues (like this one) are related to breaking changes that happened in asyncio, which was a provisional package in Python 3.4 when I wrote the book. I have since fixed some of the asyncio examples that I use in talks or courses, only to seem them break again in the next release. So my current plan is to review your contributions only when I actually start working on the 2nd edition of the book. I appreciate your contributions and I will let you know when they are added to the new edition.