[AstroPy] astropy.io.fits won't allow me to modify the NAXIS keywords

[Adam Ginsburg]

> Do you know what would be the best syntax to add a trailing dimension from
> a 2D image? I mean, in a clever way without doubling the memory consumption.
>
>
I'm not sure this is what you meant to ask, but I'll answer:

The simplest way to expand an array's dimensions without expanding its
memory consumption is with an indexing trick.  This will turn a 2D array
(assuming the original file was 2D) into a 4D array with dimensions 3 and 4
having size 1:

data = fits.getdata(filename)
data[:, :, None, None]
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