decorators-fib.py

from functools import wraps


def dec(f):
    @wraps(f)
    def wrapper(i):
        print("wrapper")
        return f(i)
    return wrapper


@dec
def fib(a):
    print("fib", a)
    if a == 0: return 1
    if a == 1: return 1
    return fib(a - 1) + fib(a - 2)