extend(self, cards, strip=True, unique=False, update=False, update_first=False, useblanks=True, bottom=False, end=False)
An iterable of (keyword, value, [comment]) tuples; see Header.append
.
Remove any keywords that have meaning only to specific types of HDUs, so that only more general keywords are added from extension Header or Card list (default: :None:None:`True`).
If :None:None:`True`, ensures that no duplicate keywords are appended; keywords already in this header are simply discarded. The exception is commentary keywords (COMMENT, HISTORY, etc.): they are only treated as duplicates if their values match.
If :None:None:`True`, update the current header with the values and comments from duplicate keywords in the input header. This supersedes the unique
argument. Commentary keywords are treated the same as if unique=True
.
If the first keyword in the header is 'SIMPLE', and the first keyword in the input header is 'XTENSION', the 'SIMPLE' keyword is replaced by the 'XTENSION' keyword. Likewise if the first keyword in the header is 'XTENSION' and the first keyword in the input header is 'SIMPLE', the 'XTENSION' keyword is replaced by the 'SIMPLE' keyword. This behavior is otherwise dumb as to whether or not the resulting header is a valid primary or extension header. This is mostly provided to support backwards compatibility with the old Header.fromTxtFile
method, and only applies if update=True
.
These arguments are passed to Header.append
while appending new cards to the header.
Appends multiple keyword+value cards to the end of the header, similar to :None:None:`list.extend`.
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