Validate Mainland China ID Number

validate_id.py

def is_valid_id_number(id):
    """
    Validate Mainland China ID Number
    :param id: Identity Number
    :return: True if id is a valid identity number, else False
    """
    if len(id) != 18:
        return False
    check_digits = ('1', '0', 'x', '9', '8', '7', '6', '5', '4', '3', '2')
    factor = (7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2)
    remainder = sum([int(v)*factor[i] for i, v in enumerate(id[:-1])]) % 11
    return check_digits[remainder] == id[-1]