import time

def bad_timeit(f):
	def timeitwrapper(*args, **kwargs):
		start = time.time()
		result = f(*args, **kwargs)
		stop = time.time()
		elapsed = stop - start
		print("the function", f.__name__, "has been executed in", elapsed, "s.")
		return result
	return timeitwrapper

def _recursive_fibonacci(n):
	if n in (0, 1):
		return 1
	return _recursive_fibonacci(n - 1) + _recursive_fibonacci(n - 2)

@bad_timeit
def recursive_fibonacci(n):
	return _recursive_fibonacci(n)

if( __name__ == "__main__"):
	recursive_fibonacci(43)