pdlem...@earthlink.net, if you are using Psyco and you aren't using NumPy and you want max speed you may use:
NROWS = 24
NCOLS = 75
screen = array("H", [0]) * (NROWS * NCOLS)
and then you can use items like this:
screen[r * NCOLS + c]
(If NCOLS is equal or a bit lower than a power of 2 it's better to use
a shift).
But in most situations using lists of lists or NumPy is better.
Bye,
bearophile
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