[BiteCode_dev]

> Don't let dicts spoil your code (2020) (roman.pt) * Conditions applies

* Apply only for when parsing I/O. Do not substitute primitives with classes inside your code base for no good reason. Unless validation is needed, prefer a NamedTuple.

[Hackbraten]

Other than validation, I can imagine several good reasons why one might want to wrap a primitive inside a class.

For example, you may have a function:

    group_by_age() -> Dict[int, List[str]]

which might be perfectly good for your use case, but I can see why one might instead prefer:

    group_by_age() -> Dict[Age, List[CustomerId]]

for self-documentation and expressiveness.

Your test assertions may also become easier to read:

    assert group_by_age() == {
        Age(23): [
            CustomerId("0471"),
            CustomerId("3390"),
        ],
        Age(42): [
            CustomerId("2334"),
        ],
    }

[BiteCode_dev]

Use NewType for this: https://mypy.readthedocs.io/en/stable/more_types.html?highli...