panscan.py

import re
import sys
def luhn_checksum(card_number):
    def digits_of(n):
        return [int(d) for d in str(n)]
    digits = digits_of(card_number)
    odd_digits = digits[-1::-2]
    even_digits = digits[-2::-2]
    checksum = 0
    checksum += sum(odd_digits)
    for d in even_digits:
        checksum += sum(digits_of(d*2))
    return checksum % 10

def is_luhn_valid(card_number):
    return luhn_checksum(card_number) == 0

count = 0
pattern = re.compile(r'\b[0-9]{13,16}\b')
for line in open(sys.argv[1]):
    matches = re.findall(pattern,line)
    for match in matches:
        if is_luhn_valid(match):
            count = count + 1
            print(match)

if count > 0:
    print("{0},{1}".format(sys.argv[1],count))