Post

Use the type `Literal` in your Python function signatures for arguments that represent options. This is better than using the general type that the configurations fall into. Stricter is better since it'll catch more bugs, earlier. It also helps document the valid values.

I’d recommend an Enum instead :-)

Literals are structural types (enums nominal), they don't require a separate class to define, don't require an import (if they're strings or ints), so I default to literals nowadays.

How do you define a literal with strings or ints without an import?

You don't need to import it to use it (= pass it to a function or class as an argument), you still need to import it to define it, is what I meant :)