Libraries are collections of shared code. They're common in Python, where they're also called "modules," but they're also ...

Python is importing your own file (random.py) instead of the actual random module from the standard library. Classic shadowing bug.

Ubuntu is a free computer system, like Windows or macOS, but it’s built by a community. It’s great for programmers because it’s very flexible and has lots of tools already built-in that help you code.