hashes/luhn.py · python/Python

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Python

hashes

luhn.py

luhn.py 1.20 KB

""" Luhn Algorithm """
from __future__ import annotations

def is_luhn(string: str) -> bool:
 """
 Perform Luhn validation on an input string
 Algorithm:
 * Double every other digit starting from 2nd last digit.
 * Subtract 9 if number is greater than 9.
 * Sum the numbers
 *
 >>> test_cases = (79927398710, 79927398711, 79927398712, 79927398713,
 ... 79927398714, 79927398715, 79927398716, 79927398717, 79927398718,
 ... 79927398719)
 >>> [is_luhn(str(test_case)) for test_case in test_cases]
 [False, False, False, True, False, False, False, False, False, False]
 """
 check_digit: int
 _vector: list[str] = list(string)
 __vector, check_digit = _vector[:-1], int(_vector[-1])
 vector: list[int] = [int(digit) for digit in __vector]

vector.reverse()
 for i, digit in enumerate(vector):
 if i & 1 == 0:
 doubled: int = digit * 2
 if doubled > 9:
 doubled -= 9
 check_digit += doubled
 else:
 check_digit += digit

return check_digit % 10 == 0

if __name__ == "__main__":
 import doctest

doctest.testmod()
 assert is_luhn("79927398713")
 assert not is_luhn("79927398714")

一键复制编辑原始数据按行查看历史

Christian Clauss 提交于 2021年09月07日 19:37 +08:00 . Pyupgrade to Python 3.9 (#4718)

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""" Luhn Algorithm """
from __future__ import annotations


def is_luhn(string: str) -> bool:
 """
 Perform Luhn validation on an input string
 Algorithm:
 * Double every other digit starting from 2nd last digit.
 * Subtract 9 if number is greater than 9.
 * Sum the numbers
 *
 >>> test_cases = (79927398710, 79927398711, 79927398712, 79927398713,
 ... 79927398714, 79927398715, 79927398716, 79927398717, 79927398718,
 ... 79927398719)
 >>> [is_luhn(str(test_case)) for test_case in test_cases]
 [False, False, False, True, False, False, False, False, False, False]
 """
 check_digit: int
 _vector: list[str] = list(string)
 __vector, check_digit = _vector[:-1], int(_vector[-1])
 vector: list[int] = [int(digit) for digit in __vector]

 vector.reverse()
 for i, digit in enumerate(vector):
 if i & 1 == 0:
 doubled: int = digit * 2
 if doubled > 9:
 doubled -= 9
 check_digit += doubled
 else:
 check_digit += digit

 return check_digit % 10 == 0


if __name__ == "__main__":
 import doctest

 doctest.testmod()
 assert is_luhn("79927398713")
 assert not is_luhn("79927398714")