import time, random

# decorator function
def my_timer(func):

    def wrapper(*args, **kwargs):
        print("my_timer call")

        start = time.time()
        result = func(*args, **kwargs)
        print("my_timer result:", time.time()-start)

        return result

    return wrapper


def print_something_decorator(func):

    def wrapper(*args, **kwargs):
        print("print_something_decorator call")
        return func(*args, **kwargs)

    return wrapper

@my_timer
@print_something_decorator
def get_all_files(root_folder):
    print("Listing all files in", root_folder)
    time.sleep( random.randint(2,10) )
    print("Data ready!")


get_all_files("c:/temp/photos")