Little Python script to validate bank account numbers

bank.py

import sys

n = sys.argv[1] if len(sys.argv) > 1 else '12001008-00238600-00100004'
n = n.split('-')
m = [9, 7, 3, 1] * 2
banks = {
  '100': 'Magyar Államkincstár',
  '101': 'Budapest Bank',
  '103': 'MKB Bank',
  '104': 'K&H Bank',
  '107': 'CIB Bank',
  '109': 'UniCredit Bank',
  '114': 'NHB Növekedési és Hitelbank',
  '115': 'Takarékbank',
  '116': 'Erste Bank',
  '117': 'OTP Bank',
  '120': 'Raiffeisen Bank',
  '121': 'Gránit Bank',
  '128': 'Merkantil Bank',
  '131': 'BNP-Paribas Magyarországi fióktelepe',
  '135': 'KDB Bank',
  '137': 'ING Bank',
  '141': 'Sberbank',
  '142': 'Commerzbank',
  '162': 'MagNet Bank',
  '163': 'Magyar Cetelem Bank',
  '175': 'Bank of China',
  '176': 'Sopron Bank',
  '182': 'FHB'
}
acc = 0

for i in range(len(n)):
  n[i] = n[i].ljust(8, '0')
  for i2 in range(8):
    acc += int(n[i][i2]) * m[i2]

print('Account number:', n)
print('Bank:', banks[n[0][0:3]] if n[0][0:3] in banks else 'Unknown Bank', end='')
print(' (For more detailed info about the account, visit: https://www.bankkereso.eu/)')
print('Checksum:', acc)
print('Valid:', (acc % 10 == 0))
if (acc % 10 > 0):
  c = 10 - ((acc - int(n[-1][-1])) % 10)
  c = c if c < 10 else 0
  print('Correct checksum would be:', c)