How nasty is this?

gistfile1.py

from oscar_op.ingram import files, converters


class Hmmm(files.FileReader):

    rows = {
        "R1": type(
            'R1Row',
            (files.Row, object),
            {
                "format": [
                    ('first', '2s', converters.StringConverter(2)),
                    ('second', '4s', converters.StringConverter(4)),
                    ('third', '6s', converters.StringConverter(6)),
                ]
            }
        ),
        "R2": type(
            'R2Row',
            (files.Row, object),
            {
                "format": [
                    ('first', '2s', converters.StringConverter(2)),
                    ('second', '4s', converters.StringConverter(4)),
                    ('third', '6s', converters.StringConverter(6)),
                ]
            }
        ),
        "R3": type(
            'R3Row',
            (files.Row, object),
            {
                "format": [
                    ('first', '2s', converters.StringConverter(2)),
                    ('second', '4s', converters.StringConverter(4)),
                    ('third', '6s', converters.StringConverter(6)),
                ]
            }
        )
    }