In the Python 3 tutorial about data structures, in the section about nested list comprehensions (http://docs.python.org/py3k/tutorial/datastructures.html#nested-list-compreh...); the zip function is described differently than it works in my installation (Ubuntu 12.04). I'm fairly new to Python so the issue is probably described best using an example:

$ python3 Python 3.2.3 (default, May 3 2012, 15:51:42) [GCC 4.6.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> matrix = [ ... [1, 2, 3, 4], ... [5, 6, 7, 8], ... [9, 10, 11, 12], ... ] >>> zip(*matrix) <zip object at 0x1053098>

However, in the tutorial the zip function returns a list of tuplets like this:

>>> zip(*matrix) [(1, 5, 9), (2, 6, 10), (3, 7, 11), (4, 8, 12)]

In order to get that result, I have to do this in my installation:

>>> list(zip(*matrix)) [(1, 5, 9), (2, 6, 10), (3, 7, 11), (4, 8, 12)]

Without looking too deep into it, it appears that the example has not been ported to Python 3. Please open an issue in the bug tracker for this. Eli