Přečti kód pozorně

from typing import Callable, ParamSpec, TypeVar
from functools import wraps
import inspect


P = ParamSpec("P")
R = TypeVar("R")


def trace(fn: Callable[P, R]) -> Callable[P, R]:
    @wraps(fn)
    def wrapper(*args: P.args, **kwargs: P.kwargs) -> R:
        print(f"calling {fn.__name__}")
        result = fn(*args, **kwargs)
        print(f"returned {result!r}")
        return result
    return wrapper


@trace
def add(a: int, b: int) -> int:
    return a + b


@trace
def greet(name: str, *, prefix: str = "Hi") -> str:
    return f"{prefix}, {name}"


result = add(2, 3)
print(f"=> {result}")

result = greet("Ada", prefix="Hello")
print(f"=> {result}")

sig = inspect.signature(add)
print(f"add sig: {sig}")

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