Sure. Gelman and Hill’s multilevel regression textbook is really nice, but it’s in R. The relevant sections of Gelman et al.'s Bayesian Data Analysis are good and it’s available free online through the book’s home page. It’s much more mathy.
There are a lot of shorter tutorials around. Here are two from PyMC. One’s based on of Gelman’s papers:
and one’s based on McElreath’s book:
McElreath’s book Statistical Rethinking is a really great place to start. Although it was written for R and Stan, the lessons are all very high level and general and abstracted from impelemntation details. I think all the examples have been translated to PyMC.