Most efficient way to "pre-grow" a list?

[Paul Rubin]

kj <no.email at please.post> writes:
> >>> arr[999] = 42
>    ...
> The best I can come up with is this:
> arr = [None] * 1000000
> Is this the most efficient way to achieve this result?

If you're talking about an array of ints, use the array module.
You might also look at numpy.