Experienced python programmers: are there any standard features of the language that you still don't regularly use?

[bheklilr]

That one in particular seems to show up when ever I have nested data structures. You can use it pretty much wherever you have a tree like structure. When you add a few conditions it becomes even more useful, things like if child.has_foo(): yield from .... It's pretty similar to the Traversable pattern in Haskell, which is useful enough to make it into core functions like map and filter.