Iranian National Code Validator

iranian_national_code_validator.py

def check(code):
    """This is the python version of the javascript function from `https://www.samanese.ir/checknin`
       for validating iranian national code


        function validateNIN(snin) {
            // if string nin length is less than 10 character
            if (snin.length < 10) {
                // wrong nin
                return false;
            } else {
                // check for valid pattern
                if (snin == '0000000000' || snin == '1111111111' || snin == '2222222222' || snin == '3333333333' || snin == '4444444444' || snin == '5555555555' || snin == '6666666666' || snin == '7777777777' || snin == '8888888888' || snin == '9999999999') {
                    return false;
                } else {
                    // check for parity with refahi.ir check function
                    var c = parseInt(snin.charAt(9));
                    var n = parseInt(snin.charAt(0)) * 10 +
                        parseInt(snin.charAt(1)) * 9 +
                        parseInt(snin.charAt(2)) * 8 +
                        parseInt(snin.charAt(3)) * 7 +
                        parseInt(snin.charAt(4)) * 6 +
                        parseInt(snin.charAt(5)) * 5 +
                        parseInt(snin.charAt(6)) * 4 +
                        parseInt(snin.charAt(7)) * 3 +
                        parseInt(snin.charAt(8)) * 2;
                    var r = n - parseInt(n / 11) * 11;
                    //             return (r == 0 && r == c) || (r == 1 && c == 1) || (r > 1 && c == 11 - r);
                    if ((r == 0 && r == c) || (r == 1 && c == 1) || (r > 1 && c == 11 - r)) {
                        return true;
                    } else {
                        return false
                    }
                }

            }
        }

    """
    if len(code) != 10:
        return False

    if len(set(code)) == 1:
        return False

    c = int(code[9])
    n = (
        int(code[0]) * 10
        + int(code[1]) * 9
        + int(code[2]) * 8
        + int(code[3]) * 7
        + int(code[4]) * 6
        + int(code[5]) * 5
        + int(code[6]) * 4
        + int(code[7]) * 3
        + int(code[8]) * 2
    )
    r = n - int(n / 11) * 11
    if (r == 0 and r == c) or (r == 1 and c == 1) or (r > 1 and (c == 11 - r)):
        return True
    return False