Sha256: 46873a19cc749f36a91aaf5bb4e3878044aeee62137c6668d71ac1d4c1278951
Contents?: true
Size: 628 Bytes
Versions: 116
Compression:
Stored size: 628 Bytes
Contents
class Luhn(object):
def __init__(self, number):
self.number = number
def addends(self):
def luhn_transform(n):
return (2 * n - 9) if (n > 4) else (2 * n)
old_digits = [int(d) for d in str(self.number)]
return [(luhn_transform(n) if (i % 2 == 0) else n)
for i, n in enumerate(old_digits, start=len(old_digits) % 2)]
def checksum(self):
return sum(self.addends())
def is_valid(self):
return self.checksum() % 10 == 0
@staticmethod
def create(n):
diff = (10 - Luhn(n * 10).checksum()) % 10
return 10 * n + diff
Version data entries
116 entries across 116 versions & 1 rubygems