The typing (>= python 3.6?) and collections (>= python 3.8?) packages have definitions for a bunch of protocols (basically interfaces for structural typing). S

The typing (>= python 3.6?) and collections (>= python 3.8?) packages have definitions for a bunch of protocols (basically interfaces for structural typing). So for that List[int] example, you probably want to take a(n) Iterable[int], Iterator[int], or Collection[int] instead, depending on exactly how you use it.