This is the "online" (abridged) version of this book:

https://www.amazon.com/Bayesian-Methods-Hackers-Probabilisti...

There's a full version of another good book ("Think Bayes: Bayesian Statistics in Python") available as a PDF from the publisher here:

http://greenteapress.com/wp/think-bayes/

(related Amazon reviews)

https://www.amazon.com/Think-Bayes-Bayesian-Statistics-Pytho...