individual's ID card number in python

[danpek]

Hello everyone,
How can I check the integrity of an individual's ID card number by typing 9 numbers by a user in python?

[buran]

well that depends - do you have algorithm (e.g. is there a check-sum number)? Note that you can check that it is correct based on algorithm, not that it is actually issued...
Or do you have access to a police/government database with valid ID numbers?

[DeaD_EyE]

You can search for already existing algorithms to generate checksums.
You can do also your own algorithm.

A very simple implementation:

def gen_checksum(number):
    return number * 123 % 99

def num2id(number):
    checksum = gen_checksum(number)
    return number * 100 + checksum

def get_checksum(id_number):
    number = id_number // 100
    checksum = id_number - number * 100
    return number, checksum

def check(id_number):
    number, checksum = get_checksum(id_number)
    return id_gen(number) == checksum

valid_numbers = [num2id(number) for number in range(1000, 1021)]
check(102027)

The modulo 99 limits the checksum to 99.