fast sub list operations

[Skip Montanaro]

    >> >>> zip([1,2,3],[7,8,9])
    >> [(1, 7), (2, 8), (3, 9)]

    Robin> I know about NumPy and like it a lot, but it's a bit heavyweight
    Robin> for what we need. I also know about zip and apart from there
    Robin> being no unzip it doesn't join up my list which should look like
    Robin> [1,7,2,8,3,9].

Whoops...  Try this instead:

    >>> l = zip([1,2,3],[7,8,9])
    >>> reduce(operator.add, l, ())
    (1, 7, 2, 8, 3, 9)

Obviously, if you need a list, you can apply that function to the result.

-- 
Skip Montanaro (skip at pobox.com)
http://www.mojam.com/
http://www.musi-cal.com/