zip() returns an iterator, make a list() of it; thanks to Martin from docs@

Doc/tutorial/datastructures.rst

@@ -292,7 +292,7 @@ which, in turn, is the same as::
 In the real world, you should prefer built-in functions to complex flow statements.
 The :func:`zip` function would do a great job for this use case::
 
-   >>> zip(*matrix)
+   >>> list(zip(*matrix))
    [(1, 5, 9), (2, 6, 10), (3, 7, 11), (4, 8, 12)]
 
 See :ref:`tut-unpacking-arguments` for details on the asterisk in this line.