Tensorflow library now unusable with this book.

Hello.
I enjoy learning from this book a lot, but after getting to chapter 9, I have noticed that learning
is basically impossible because so much has changed about tensorflow sessions.

Has it been corrected somewhere online? Can I find some code that will be working with the new
tensorflow library? Because honestly, without this, this book is only usable in half, since all the tensorflow stuff is outdated, and why would someone bother learning an outdated library?