However, I'm missing some inheritance piece here or global variables since if I run this second smaller function to add 01 to millisecond 999 it replaces 999 with 01, it doesn't add to it.

Learn how Python's dictionary data structure works as a powerful and versatile way to store and retrieve objects and data in your applications.

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