IBAN: Difference between revisions

=={{header|Python}}==

{{trans|Ruby}}

<lang python>import re

_country2length = dict(

AL=28, AD=24, AT=20, AZ=28, BE=16, BH=22, BA=20, BR=29,

BG=22, CR=21, HR=21, CY=28, CZ=24, DK=18, DO=28, EE=20,

FO=18, FI=18, FR=27, GE=22, DE=22, GI=23, GR=27, GL=18,

GT=28, HU=28, IS=26, IE=22, IL=23, IT=27, KZ=20, KW=30,

LV=21, LB=28, LI=21, LT=20, LU=20, MK=19, MT=31, MR=27,

MU=30, MC=27, MD=24, ME=22, NL=18, NO=15, PK=24, PS=29,

PL=28, PT=25, RO=24, SM=27, SA=24, RS=22, SK=24, SI=19,

ES=24, SE=24, CH=21, TN=24, TR=26, AE=23, GB=22, VG=24 )

def valid_iban(iban):

# Ensure upper alphanumeric input.

iban = iban.replace(' ','').replace('\t','')

if not re.match(r'^[\dA-Z]+$', iban):

return False

# Validate country code against expected length.

if len(iban) != _country2length[iban[:2]]:

return False

# Shift and convert.

iban = iban[4:] + iban[:4]

digits = int(''.join(ch if ch.isdigit() else str(10 - ord('A') + ord(ch))

for ch in iban))

return digits % 97 == 1

if __name__ == '__main__':

for account in ["GB82 WEST 1234 5698 7654 32", "GB82 TEST 1234 5698 7654 32"]:

print('%s validation is: %s' % (account, valid_iban(account)))</lang>

{{out}}

<pre>GB82 WEST 1234 5698 7654 32 validation is: True

GB82 TEST 1234 5698 7654 32 validation is: False</pre>