[Tutor] Function returns 'None'

[Alan Gauld]

"Dominik Danter" <dotti at socialnerds.org> wrote

> def recursfac(x,carryover=1):
>     print 'x:',x,'carryover:', carryover
>     if x > 1:
>         carryover *= x
>         recursfac(x-1, carryover)

No return value here so when the reursed function returns carryover
we have nowhere to go in the calling function so we return None.

>     else:
>         return carryover

This returns a value to the calling function, but in 
the recursive case that returned vaklue uis thrown away 
as the comment above shows.

you need to add a return statement where you call recursively.

HTH,

-- 
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/