Using and Implementing iterators with classes such as linked lists

[Aahz]

In article <Xns94445A429CFEduncanrcpcouk at 127.0.0.1>,
Duncan Booth  <duncan at rcp.co.uk> wrote:
>
>def __iter__(self):
>    def iterate(current):
>        while current.next is not None:
>            next = current.next
>    	       yield current
>            current = next
>    return iterate(self)

Huh?  Why the extra function and complexity?

def __iter__(self):
    current = self
    while current is not None:
        yield current
        current = current.next
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Weinberg's Second Law: If builders built buildings the way programmers wrote 
programs, then the first woodpecker that came along would destroy civilization.