The zip() function is now a generator in Python 3.0.  There is an
example of using the zip() function in the Python 3.0 tutorial,
http://docs.python.org/dev/3.0/tutorial/datastructures.html.

When running the example, I got:

>>> mat = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> zip(*mat)
<zip object at 0x70fc60>

I wrapped it in a call to list() to get the example output:

>>> list(zip(*mat))
[(1, 4, 7), (2, 5, 8), (3, 6, 9)]


The attached patch file contains this change.