Details
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Type:
Improvement
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Status: Done
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Resolution: Done
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Fix Version/s: None
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Component/s: Third Party Software
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Labels:None
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Story Points:1
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Sprint:Arch 2019-04-08
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Team:Architecture
Astropy does it by having a astropy.io.fits.card.Undefined special value. That strikes me as really unhelpful since it doesn't behave like any other value that you might expect. It also acts like it's True so you can't say if "FILTER" in header and header["FILTER"]: but have to have special code for dealing with is Undefined.