I had a structure that looked like this ((0,1), (2, 3), (4, 5), (6,7) I changed my code slightly and now I do this: odd = (1,3,5,7) even = (0,2,4,6) all = zip(even, odd) however the zip produces: [(0, 1), (2, 3), (4, 5), (6, 7)] Which is a list of tuples.. I wanted a tuple of tuples...