from .money_currency_digits_data import CURRENCY_DIGITS


def currency_digits(currency: str) -> int:
    """Decimal places in a currency's minor unit, per ISO 4217.

    Dividing by 100 is wrong for yen, won, dinar and a few dozen others, so
    anything moving between minor and major units asks here.
    """
    for row in CURRENCY_DIGITS:
        if row.code == currency:
            return row.digits
    raise ValueError('no ISO 4217 minor unit for currency "%s"' % (currency,))