add_checksum(self, when=None, override_datasum=False, checksum_keyword='CHECKSUM', datasum_keyword='DATASUM')
For testing purposes, first call add_datasum
with a when
argument, then call add_checksum
with a when
argument and override_datasum
set to :None:None:`True`. This will provide consistent comments for both cards and enable the generation of a CHECKSUM
card with a consistent value.
comment string for the cards; by default the comments will represent the time when the checksum was calculated
add the CHECKSUM
card only
The name of the header keyword to store the checksum value in; this is typically 'CHECKSUM' per convention, but there exist use cases in which a different keyword should be used
See checksum_keyword
Add the CHECKSUM
and DATASUM
cards to this HDU with the values set to the checksum calculated for the HDU and the data respectively. The addition of the DATASUM
card may be overridden.
The following pages refer to to this document either explicitly or contain code examples using this.
astropy.io.fits.hdu.base._ValidHDU.add_checksum
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