[Tutor] Function returns 'None'

[Nick Raptis]

On 07/11/2010 06:28 PM, Nick Raptis wrote:
>
> def recursfac(x,carryover=1):
>     print 'x:',x,'carryover:', carryover
>     if x > 1:
>         carryover *= x
>         carryover = recursfac(x-1, carryover)
>     return carryover
>
> And this returns
> x: 3 carryover: 1
> x: 2 carryover: 3
> x: 1 carryover: 6
> 6
>
> Done!
>

Also, I realized that my final code may be tough to decipher now.. A 
nicer way to write it would be (the functionality is still exactly the 
same):

def recursfac(x,carryover=1):
     print 'x:',x,'carryover:', carryover
     if x > 1:
         carryover *= x
         result = recursfac(x-1, carryover)
     else:
         # done with recursion, start our way up
         result = carryover
     return result