def get_header_keyword(fits_file,
keyword,
ext=0):
'''
Get the value of a header keyword in a fits file optionally using an
extension.
'''
hdulist = pyfits.open(fits_file)
if keyword in hdulist[ext].header:
val = hdulist[ext].header[keyword]
else:
val = None
hdulist.close()
return val
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