The recursive function/method must be defined at the outermost level - explanations

Question

What does it mean?

NOTE: the recursive function/method must be defined at the outermost level

      otherwise you will fail the recursion test.

Does this mean that the pharaohs_revenge function must be recursive? Or is it not necessary and can call recursive function?

Answer 1

Judging on the notes, I think that you simply need to create a recursive function, doesn't matter if it's pharaohs_revenge or something different, as long as this recursive function is not defined into another, so something such as:

def recursive():

    [...]

def pharaohs_revenge(): will be okay

But:

def pharaohs_revenge():

    [...]

    def recursive(): will not be okay as it's inside a different function