"KraftDiner" wrote:
> I have a list that starts out as a two dimensional list
> I convert it to a 1D list by:
>
> b = sum(a, [])
>
> any idea how I can take be and convert it back to a 2D list?
(you could of course keep a pointer to the original 2D list...)
anyway, to split a 1D list up in pieces, use slice notation. e.g.
step = 10
a = []
for i in range(0, len(b), step):
a.append(b[i:i+step])
or, in one line:
a = [b[i:i+step] for i in range(0, len(b), step)]
for more on list slicing, see the Python tutorial.
</F>
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