How to use the num2words.lang_EU function in num2words

def __init__(self, ordinal, case, plural, prefer):
        self.ordinal = ordinal
        self.case = case
        self.plural = plural
        self.prefer = prefer

    def variation(self, ordinal=None, case=None, plural=None, prefer=None):
        return Options(
            ordinal if ordinal is not None else self.ordinal,
            case if case is not None else self.case,
            plural if plural is not None else self.plural,
            prefer if prefer is not None else self.prefer,
        )


class Num2Word_FI(lang_EU.Num2Word_EU):
    CURRENCY_FORMS = {
        'BRL': (('real', 'realia'), GENERIC_CENTAVOS),
        'CHF': (('frangi', 'frangia'), ('rappen', 'rappenia')),
        'CNY': (('juan', 'juania'), ('fen', 'feniä')),
        'EUR': (('euro', 'euroa'), GENERIC_CENTS),
        'FIM': (('markka', 'markkaa'), ('penni', 'penniä')),  # historical
        'INR': (('rupia', 'rupiaa'), ('paisa', 'paisaa')),
        'JPY': (('jeni', 'jeniä'), ('sen', 'seniä')),  # rare subunit
        'KRW': (('won', 'wonia'), ('jeon', 'jeonia')),  # rare subunit
        'KPW': (('won', 'wonia'), ('chon', 'chonia')),  # rare subunit
        'MXN': (('peso', 'pesoa'), GENERIC_CENTAVOS),
        'RUB': (('rupla', 'ruplaa'), ('kopeekka', 'kopeekkaa')),
        'TRY': (('liira', 'liiraa'), ('kuruş', 'kuruşia')),
        'ZAR': (('randi', 'randia'), GENERIC_CENTS),
    }

# version 2.1 of the License, or (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA

from __future__ import division, print_function, unicode_literals

from . import lang_EU


class Num2Word_EN(lang_EU.Num2Word_EU):
    def set_high_numwords(self, high):
        max = 3 + 3 * len(high)
        for word, n in zip(high, range(max, 3, -3)):
            self.cards[10 ** n] = word + "illion"

    def setup(self):
        super(Num2Word_EN, self).setup()

        self.negword = "minus "
        self.pointword = "point"
        self.exclude_title = ["and", "point", "minus"]

        self.mid_numwords = [(1000, "thousand"), (100, "hundred"),
                             (90, "ninety"), (80, "eighty"), (70, "seventy"),
                             (60, "sixty"), (50, "fifty"), (40, "forty"),
                             (30, "thirty")]

# version 2.1 of the License, or (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA

from __future__ import division, print_function, unicode_literals

from . import lang_EU


class Num2Word_DK(lang_EU.Num2Word_EU):
    GIGA_SUFFIX = "illarder"
    MEGA_SUFFIX = "illioner"

    def setup(self):
        super(Num2Word_DK, self).setup()

        self.negword = "minus "
        self.pointword = "komma"
        self.exclude_title = ["og", "komma", "minus"]

        self.mid_numwords = [(1000, "tusind"), (100, "hundrede"),
                             (90, "halvfems"), (80, "firs"),
                             (70, "halvfjerds"), (60, "treds"),
                             (50, "halvtreds"), (40, "fyrre"), (30, "tredive")]
        self.low_numwords = ["tyve", "nitten", "atten", "sytten",
                             "seksten", "femten", "fjorten", "tretten",

# version 2.1 of the License, or (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA

from __future__ import division, print_function, unicode_literals

from . import lang_EU


class Num2Word_RO(lang_EU.Num2Word_EU):
    GIGA_SUFFIX = "iliard/e"
    MEGA_SUFFIX = "ilion"
    # inflection for million follows different rule
    MEGA_SUFFIX_I = "ilioane"

    def setup(self):
        super(Num2Word_RO, self).setup()

        self.negword = "minus "
        self.pointword = "virgulă"
        self.exclude_title = ["și", "virgulă", "minus"]
        self.errmsg_toobig = (
            "Numărul e prea mare pentru a fi convertit în cuvinte."
        )
        self.mid_numwords = [(1000, "mie/i"), (100, "sută/e"),
                             (90, "nouăzeci"), (80, "optzeci"),

# version 2.1 of the License, or (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA

from __future__ import division, print_function, unicode_literals

from . import lang_EU


class Num2Word_NO(lang_EU.Num2Word_EU):
    GIGA_SUFFIX = "illard"
    MEGA_SUFFIX = "illion"

    def set_high_numwords(self, high):
        cap = 3 + 6 * len(high)

        for word, n in zip(high, range(cap, 3, -6)):
            if self.GIGA_SUFFIX:
                self.cards[10 ** n] = word + self.GIGA_SUFFIX

            if self.MEGA_SUFFIX:
                self.cards[10 ** (n - 3)] = word + self.MEGA_SUFFIX

    def setup(self):
        super(Num2Word_NO, self).setup()