[Tutor] Type annotation errors

[Peter Otten]

Peter Otten wrote:

> There might be a way to tell mypy that two cases cannot occur and still
> use dicts as pseudo-structs

I found

https://mypy.readthedocs.io/en/stable/more_types.html#typeddict

with that:

from typing_extensions import TypedDict

Record = TypedDict("Record", {"shares": int, "name": str, "price": float})

def evaluate_portfolio(
          portfolio: List[Record], stock_prices: Dict[str, float]
) -> Tuple[float, float]:
    ... # body unchanged