[EMAIL PROTECTED] wrote:
> I still don't get it. I tried to test with x = 0 and found that to
> work. How come since the value of y is right and it is printed right it
> "turns into" None when returned by the return statement ?
Martin,
-a function should either return something or not. Your function has
two exit points, one explicitly returns a value, one doesn't (and so
defaults to returning None).
- trace through the function with pencil and paper for small values of
x and y
def add(x, y):
if x:
x -= 1
y += 1
add(x,y)
else:
print y
def ADD(x, y):
if x:
x -= 1
y += 1
return ADD(x,y)
else:
return y
>>>add(5,6)
11
>>>ADD(5,6)
11
>>>z = add(5,6)
11
>>>print z
None
>>>z = ADD(5,6)
>>>print z
11
Gerard
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