I will throw in my absolutely pithy two cents here, and confirm that I have had to learn to look at the age of a PyMC3 notebook - relative to how complex the modelling example is - and know when to ignore their syntax if they’re too old.
Which is not to say I’m complaining here, since you guys take the time to write amazing notebooks with very intuitive statistical explanations that help so many people, I’m just confirming what bwengals mentioned above ^^; .