I notice in the doc an example which doesn't work with this patch.  It still prints one level too deep.  The doc seems correct to me, but I don't have strong feelings any way.  The attached patch makes the doc example work as expected.  The doc should really be updated with an example more like:

>>> pp = pprint.PrettyPrinter(depth=6)
>>> pp.pprint((1, (2, (3, (4, (5, (6, 7)))))))
(1, (2, (3, (4, (5, (...))))))
>>> pp = pprint.PrettyPrinter(depth=1)
>>> pp.pprint(1)
1
>>> pp.pprint([1])
[...]

The updated patch causes the new tests to fail.  Could you update the test/code/doc to all be consistent?
File Added: pp2.diff