[Tutor] recursion surprise

[Jim Mooney]

I was trying out simple recursion as below, with the printout I
expected, but it then also prints out "None" nine times. How does that
work?

Jim

#Using Python 3.3.2 on Win 7 - standard project, standard test file

def addone(num):
    if num > 10:
        return num
    num = addone(num + 1)

print(addone(1))

Result:
11
None
None
None
None
None
None
None
None
None


-- 
Jim
"Would you use Internet Explorer if someone put a gun to your head?"
"How big is the gun?"