How to use the filetype.types.archive.Gz function in filetype

def __init__(self):
        super(Gz, self).__init__(
            mime=Gz.MIME,
            extension=Gz.EXTENSION
        )

def __init__(self):
        super(Gz, self).__init__(
            mime=Gz.MIME,
            extension=Gz.EXTENSION
        )

def __init__(self):
        super(Gz, self).__init__(
            mime=Gz.MIME,
            extension=Gz.EXTENSION
        )

audio.Ogg(),
    audio.Flac(),
    audio.Wav(),
    audio.Amr(),
)

# Supported font types
FONT = (font.Woff(), font.Woff2(), font.Ttf(), font.Otf())

# Supported archive container types
ARCHIVE = (
    archive.Epub(),
    archive.Zip(),
    archive.Tar(),
    archive.Rar(),
    archive.Gz(),
    archive.Bz2(),
    archive.SevenZ(),
    archive.Pdf(),
    archive.Exe(),
    archive.Swf(),
    archive.Rtf(),
    archive.Nes(),
    archive.Crx(),
    archive.Cab(),
    archive.Eot(),
    archive.Ps(),
    archive.Xz(),
    archive.Sqlite(),
    archive.Deb(),
    archive.Ar(),
    archive.Z(),