def get_eci_assignment_number(encoding):
    """\
    Returns the ECI number for the provided encoding.

    :param str encoding: A encoding name
    :return str: The ECI number.
    """
    try:
        return consts.ECI_ASSIGNMENT_NUM[codecs.lookup(encoding).name]
    except KeyError:
        raise QRCodeError('Unknown ECI assignment number for encoding "{0}".'
                          .format(encoding))
\
    Returns the ECI number for the provided encoding.

    :param str encoding: A encoding name
    :return str: The ECI number.