define the method add_item with 17 arguments: self, title, link, description, author_email set to None, author_name set to None,
def add_item ( self , title , link , description , author_email = None , author_name = None , author_link = None , pubdate = None , comments = None , unique_id = None , unique_id_is_permalink = None , enclosure = None , categories = ( ) , item_copyright = None , ttl = None , updateddate = None , ** kwargs ) :