I'm using VS Code with Pylance, and having problems correctly writing type hints for the following function. To me, the semantics seem clear, but Pylance disagrees. How can I fix this without resorting to cast() or # type ignore? Pylance warnings are given in the comments. I am fully committed to typing in Python, but it is often a struggle. T = TypeVar("T") def listify(item: T | list[T] | tuple[T] | None) -> list[T]: if item is None: return [] elif isinstance(item, list): return item # Return type, "List[Unknown]* | List[T@listify]", # is partially unknown elif isinstance(item, tuple): return list(item) # Return type, "List[Unknown]* | List[T@listify]", # is partially unknown else: return [item] Continue reading...
