I was recently trying to design a function that takes an optional default argument -- either a value or a callable that returns a value. I wrote this method to do so: T = TypeVar("T") def default_example(default: T | Callable[[], T] | None) -> T: # stuff if default is not None: return default() if callable(default) else default # more stuff However, my type hinter (pylance) is understandably upset because the type T itself could also be callable and its return type is not bound. Is there a way to modify this function to achieve what I want (value or callable or none) without using overloads or bounding the type variable? Continue reading...
