Python has plenty of complexity. It tends to stick it in places where new programmers don't run into it. Python is one of the few languages I know that lets you just... poke at the internal machinery like this.
Have you ever messed around w/ Julia? It doesn't really have much "internal machinery" since it relies on a data-oriented/functional language structure. I find myself reading the Julia source code on a regular basis since it's very readable and succinct. I often find it more useful than the documentation itself.
It can take a bit to fully understand/appreciate Julia's multiple dispatch, but once you do you pretty much understand the entirety of the machinery.
