insert(self, key, card, useblanks=True, after=False)
The index into the list of header keywords before which the new keyword should be inserted, or the name of a keyword before which the new keyword should be inserted. Can also accept a (keyword, index) tuple for inserting around duplicate keywords.
A keyword or a (keyword, value, [comment]) tuple; see Header.append
If there are blank cards at the end of the Header, replace the first blank card so that the total number of cards in the Header does not increase. Otherwise preserve the number of blank cards.
If set to :None:None:`True`, insert after the specified index or keyword, rather than before it. Defaults to :None:None:`False`.
Inserts a new keyword+value card into the Header at a given location, similar to :None:None:`list.insert`.
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