Re: Accessing next/prev element while for looping

Paul Rubin <http://phr.cx@xxxxxxxxxxxxxx> writes:
> elts = iter(myarray)
> prev,cur,next = elts.next(),elts.next(),elts.next()
> for next2 in elts:
> do_something_with (prev, cur, next)
> prev,cur,next = cur, next, next2
>
> Of course these fail when there's less than 3 elements.

Ehh, too clever for my own good. This fails with exactly 3 elements.
It was a "shortened" version of

elts = iter(myarray)
prev,cur,next = elts.next(),elts.next(),elts.next()
try:
while True:
do_something_with (prev, cur, next)
prev,cur,next = cur, next, elts.next()
except StopIteration: pass

which is messy, and which could get confused by do_something_with...
raising StopIteration for some reason.
.

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