Code quality

# Code quality

## Level 0

Typically a script that is ran once or occasionally. Defining characteristics include:

- No functions, code is copy-pasted rather than factored out
- No logging
- Values are hardcoded, eg. write `3.14` all over the place instead of using `PI = 3.14`
- `assert` isn't used anywhere
- No typing (or stringly-typed)
- State is everywhere
- Nested control flow

```python
for value in container:
    if value in ['some', 'hardcoded', 'values']:
        for suffix in suffixes:
            print(value + suffix)
```

## Level 1

-