The books on Amazon, in 2018.  

Caveat: Amazon sales don't mean as much today as they once did, 
given the rise of ebooks, online media, and a multitude of Python 
resources, along with Amazon's mercurial policies. 
It was once a bigger deal. 

Around this time, these books'
_<A HREF="https://oreilly.com">publisher_</A> 
was also morphing into an online-training company, 
and its web presence grew more focused on subscriptions 
than books.  It still kept making books, though, and my 
sales continued to be as strong as ever (thank you, 
discriminating customers).  

The publisher also sadly turned to sales of personal 
information and customer access—one of the reasons that my 
titles' current editions may be their last (but stay tuned 
for 2025's surprise; readers matter too).