def plural(singular, plural, seq):
    """Selects a singular or plural word based on the length of a sequence.

    Parameters
    ----------
    singlular : str
        The string to use when ``len(seq) == 1``.
    plural : str
        The string to use when ``len(seq) != 1``.
    seq : sequence
        The sequence to check the length of.

    Returns
    -------
    maybe_plural : str
        Either ``singlular`` or ``plural``.
    """
    if len(seq) == 1:
        return singular

    return plural