What information does a decorator function in Python return?

A decorator function in Python is a function that takes another function and returns a new function (or an object callable as a function). That is, the result of the decorator is a wrapper around the original function, which can modify or extend its behavior.

Example of a simple decorator:

def decorator(func):
    def wrapper(*args, **kwargs):
        print("Before calling the function")
        result = func(*args, **kwargs)
        print("After calling the function")
        return result
    return wrapper

@decorator
def say_hello(name):
    print(f"Hello, {name}!")

say_hello("World")

Here, decorator returns the wrapper function, which replaces the original say_hello. Thus, the decorator function returns a new function with modified behavior.