astropy 5.0

NotesParametersReturnsBackRef
add_datasum(self, when=None, datasum_keyword='DATASUM')

Notes

For testing purposes, provide a when argument to enable the comment value in the card to remain consistent. This will enable the generation of a CHECKSUM card with a consistent value.

Parameters

when : str, optional

Comment string for the card that by default represents the time when the checksum was calculated

datasum_keyword : str, optional

The name of the header keyword to store the datasum value in; this is typically 'DATASUM' per convention, but there exist use cases in which a different keyword should be used

Returns

checksum : int

The calculated datasum

Add the DATASUM card to this HDU with the value set to the checksum calculated for the data.

Examples

See :

Back References

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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File: /astropy/io/fits/hdu/base.py#1207
type: <class 'function'>
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