Just make a custom generator function:
>>> def prevcurnext(seq):
it = iter(seq)
prev = it.next()
cur = it.next()
for next in it:
yield (prev,cur,next)
prev,cur = cur, next
>>> for (a,b,c) in prevcurnext(range(10)):
print a,b,c
0 1 2
1 2 3
2 3 4
3 4 5
4 5 6
5 6 7
6 7 8
7 8 9
Cheers,
Bas
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