returning none when it should be returning a list?

[randomtalk at gmail.com]

John Machin wrote:
>
> That's because it "falls off the end" of the function, which causes it
> to return None. However that's not your only problem. Major other
> problem is updating "seed" in situ.
>
I'm not sure what "falls off the end" of the function means, i searched
online, it seems to mean that the function has reached the end
prematurely and returned a default identifier to signal success or
not.. Can you please explain what that means?

Other than that, thanks alot for all those who posted! It's been very
educational!