Thanks for the link!  The .next and .previous are really useful
because it makes it easy to do groupings like this:

>>> for loop, c in looper([11, 12, 13, 21, 22, 31, 32, 33]):
...     if loop.first_group(lambda i: i // 10):
...         print '---'
...     print c
...
---
11
12
13
---
21
22
---
31
32
33

The first_group method takes any callable.  For doing stuff like
drawing tables with lots of subtotal lines, this is immensely useful.

Matt
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