set(self, keyword, value=None, comment=None, before=None, after=None)
If the keyword does not already exist in the header, a new keyword is created in the specified position, or appended to the end of the header if no position is specified.
This method is similar to Header.update
prior to Astropy v0.1.
It should be noted that header.set(keyword, value)
and header.set(keyword, value, comment)
are equivalent to header[keyword] = value
and header[keyword] = (value, comment)
respectively.
New keywords can also be inserted relative to existing keywords using, for example:
>>> header.insert('NAXIS1', ('NAXIS', 2, 'Number of axes'))
to insert before an existing keyword, or:
>>> header.insert('NAXIS', ('NAXIS1', 4096), after=True)
to insert after an existing keyword.
The only advantage of using :None:meth:`Header.set` is that it easily replaces the old usage of :None:meth:`Header.update` both conceptually and in terms of function signature.
A header keyword
The value to set for the given keyword; if None the existing value is kept, but '' may be used to set a blank value
The comment to set for the given keyword; if None the existing comment is kept, but ''
may be used to set a blank comment
Name of the keyword, or index of the Card
before which this card should be located in the header. The argument before
takes precedence over after
if both specified.
Name of the keyword, or index of the Card
after which this card should be located in the header.
Set the value and/or comment and/or position of a specified keyword.
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