LOL, just assign that beast of a type to a name and roll with it: Thing = List[Tuple[Tuple[str, int, str], Tuple[int, float, float]]] def foo(t: Thing)

LOL, just assign that beast of a type to a name and roll with it: Thing = List[Tuple[Tuple[str, int, str], Tuple[int, float, float]]] def foo(t: Thing) -> Thing: ...