From 0020e80406f63e1768d502e4f48711fe19bce8fb Mon Sep 17 00:00:00 2001
From: Carlos Vega <carlos.vega@uni.lu>
Date: Tue, 30 Oct 2018 09:53:01 +0100
Subject: [PATCH] added method calculate_luhn_checksum
---
smash/web/algorithm/luhn_algorithm.py | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/smash/web/algorithm/luhn_algorithm.py b/smash/web/algorithm/luhn_algorithm.py
index c752bc33..ae550c43 100644
--- a/smash/web/algorithm/luhn_algorithm.py
+++ b/smash/web/algorithm/luhn_algorithm.py
@@ -1,12 +1,14 @@
+def digits_of(n):
+ return [int(d) for d in str(n)]
+
+
class LuhnAlgorithm(object):
+
def __init__(self):
pass
@staticmethod
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]
@@ -19,3 +21,7 @@ class LuhnAlgorithm(object):
@staticmethod
def is_luhn_valid(card_number):
return LuhnAlgorithm.luhn_checksum(card_number) == 0
+
+ @staticmethod
+ def calculate_luhn_checksum(card_number):
+ return (10 - LuhnAlgorithm.luhn_checksum(card_number + '0')) % 10
--
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