Adding through recursion

[[EMAIL PROTECTED]]

There is problaly a really simple answer to this, but why does this
function print the correct result but return "None":

def add(x, y):
    if x == 0:
        print y
        return y
    else:
        x -= 1
        y += 1
        add(x, y)

print add(2, 4)

result:
6
None

Martin

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