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

Take advantage of the high-level async functions in Python’s asyncio library to write more efficient Python applications.

Use PyInstaller to package your Python apps into standalone executables for easy distribution.

This post explains what a Python module is and how to use it to drastically extend the capabiltiies of your code. Plus: how to make your own!