methods of ImageFileCollection should accept multiple values for a keyword

[bsipocz]

I was unable to find a way to filter out hdus in a one liner that has the object name as either “FLAT” or “DOME”. If would be rather nice to be able to specify a given keyword twice, or give a list or similar to it.

My current workaround is rather ugly:

from ccdproc import ImageFileCollection
import itertools

image_coll = ImageFileCollection('rawdir')
fl = image_coll.hdus(return_fname=True, object='FLAT’)
do = image_coll.hdus(return_fname=True, object=‘DOME’)
flats = itertools.chain(fl, do)

[bsipocz]

A somewhat related feature request is to have a way to use formal logic for the keyword value matching. E.g. have a generator for everything that is not a bias, or not 2x2 binning, etc.

(if you prefer to have singe requests per issues I can open another one).

[SaOgaz]

If i'm understanding this correctly and can add to this request, it would be great to use <, > with some of the keyword values, i.e. exptime > 300.

[mwcraig]

I would really like to get input from @duckrojo on this and ideally perhaps incorporate some of dataproc here 😀.