Abusing the List Exploding Asterisk for Fun and Profit

def getname(name_type, **kwargs):
    """Automatically calculates the output filename for all file types,
largely smoothing over the differences that the classes above makes."""
    # Extremely repetitive code!
    def fromkwargs(*keys):
        return [kwargs[key] for key in keys]
    if name_type == "den":
        page_outname = TheDen().autoname(*fromkwargs('original_file_name'))
    elif name_type == "boc":
        page_outname = (BocPage().autoname(*fromkwargs(
            'title', 'book', 'page', 'subpage', 'categories', 'genre')))
    elif name_type == "purple":
        page_outname = (BocPurplePage().autoname(*fromkwargs(
            'title', 'book', 'page', 'subpage', 'categories', 'genre')))
    elif name_type == "nboc":
        page_outname = (BocNonbookPage().autoname(*fromkwargs(
            'title', 'page', 'categories', 'genre')))
    elif name_type == "uncategorised":
        page_outname = NonBocPage().autoname()
    else: raise CaseFallthroughException()
    return page_outname