Validate Greek IBAN

gistfile1.py

import string 
def VAlidateIBAN_GR(IBAN):

if len(IBAN) != 27 or IBAN[0].isalpha() == False or IBAN[1].isalpha() == False or IBAN[2:].isdigit() == False:
	return False;

alph={};
i=10;

for x in string.ascii_uppercase:
	alph[x]=i
	i = i+1
decIBAN = int(IBAN[4:]+str(alph[IBAN[0]]) + str(alph[IBAN[1]]) + IBAN[2] + IBAN[3]) % 97
if decIBAN == 1:
	return True
else:
	return False