printdiff(inputa, inputb, *args, **kwargs)
The primary use for the printdiff
function is to allow quick print out of a FITS difference report and will write to sys.stdout
. To save the diff report to a file please use FITSDiff
directly.
The filename of a FITS file, HDUList
, or HDU
object to compare to inputb
.
The filename of a FITS file, HDUList
, or HDU
object to compare to inputa
.
Additional positional arguments are for extension specification if your inputs are string filenames (will not work if inputa
and inputb
are HDU
objects or HDUList
objects). They are flexible and are best illustrated by examples. In addition to using these arguments positionally you can directly call the keyword parameters ext
, extname
.
By extension number:
printdiff('inA.fits', 'inB.fits', 0) # the primary HDU
printdiff('inA.fits', 'inB.fits', 2) # the second extension
printdiff('inA.fits', 'inB.fits', ext=2) # the second extension
By name, i.e., EXTNAME
value (if unique). EXTNAME
values are not case sensitive:
printdiff('inA.fits', 'inB.fits', 'sci') printdiff('inA.fits', 'inB.fits', extname='sci') # equivalent
By combination of EXTNAME
and EXTVER
as separate arguments or as a tuple:
printdiff('inA.fits', 'inB.fits', 'sci', 2) # EXTNAME='SCI'
# & EXTVER=2
printdiff('inA.fits', 'inB.fits', extname='sci', extver=2)
# equivalent
printdiff('inA.fits', 'inB.fits', ('sci', 2)) # equivalent
Ambiguous or conflicting specifications will raise an exception:
printdiff('inA.fits', 'inB.fits',
ext=('sci', 1), extname='err', extver=2)
Any additional keyword arguments to be passed to FITSDiff
.
Compare two parts of a FITS file, including entire FITS files, FITS HDUList
objects and FITS HDU
objects.
The following pages refer to to this document either explicitly or contain code examples using this.
astropy.io.fits.convenience.printdiff
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