MicroOS (and its flavors) update the same way Android does; as a full image

They don’t. They update with regular packages. The updates are atomic though and are only applied at next boot, so there’s less of a risk of weird breakages.

So what?

When you need a doubly-linked list in Python, you can use the deque data structure, which is in the collections module

When do I need a doubly-linked list in Python? Whenever I have something where I can often expect to interact with the first and last element of it? Always, because it’s more efficient than shifting the entire list around? Something else entirely?