Efficient python 2-d arrays?

[Jake Biesinger]

> Without using third party libraries, no not really.  numpy has it
> covered so there's not really a lot of demand for it.  If your users
> are loading 1.5 GB arrays into memory, it's probably not unreasonable
> to expect them to have numpy installed.

My users are biologists, and I can't expect them to have numpy (and the barrier to entry for this group is particularly high).