Precise typing of kwargs but without a TypedDict

[bschubert (Brian Schubert)]

Some related threads:

Extract kwargs types from a function signature

Let’s say I have some function def do_some_stuff( *, foo: int, bar: float | None = None, baz: BazEnum = BazEnum.SPAM, ) -> int: ... And some wrapper around it, for example to add default/error handling: def do_some_stuff_safe( *, default: int = 3, **kwargs: Any, ) -> int: try: return do_some_stuff(**kwargs) except ValueError: return default I’d like to express that **kwargs must match do_some_stuff signature using the static type system…

Dynamically building ParamSpecs from callables

Suppose I have a class with an initializer but then I want to add a subclass which adds a keyword argument. I’m going to show it written a particular way and then explain why it’s written that way. class Cheeseshop: def __init__( self, # much as I want to, I won't list all of the cheeses... red_leicester: bool = False, tilsit: bool = False, caerphilly: bool = False, stilton: bool = False, ) -> None: self.red_leicester = red_leicest…