Here's the code # args: argparse.Namespace source: str = args.source ... # subparsers: argparse._SubParsersAction parser = subparsers.add_parser() In the first line of code, : str is enough to tell Pylance that source is a string, although args.source is Any. However, in the second line, when I add : argparse.ArgumentParser, the type of parser is still Any | argparse.ArgumentParser. I have to manually use cast(argparse.ArgumentParser) to get the desired effect, since add_parser() is typed as returing Any. Why is that the case? Both are assignment to me, one from a field, one from the return of a function. Continue reading...
