Python practicals: debug async code, find files by pattern, read nested JSON

A set of short practical Python tasks:

1. Read a helper class that keeps pulling data from a response and writing it out, and explain what it is for.
2. Debug a piece of asynchronous Python code.
3. Write a function that returns the path of every file matching a pattern, and read a CSV file.
4. Load a JSON document nested about five levels deep and pull out the values asked for.