Refs #23613 -- Removed django.utils.checksums per deprecation timeline.

django/utils/checksums.py

-"""
-Common checksum routines.
-"""
-
-__all__ = ['luhn']
-
-import warnings
-
-from django.utils import six
-from django.utils.deprecation import RemovedInDjango110Warning
-
-warnings.warn(
-    "django.utils.checksums will be removed in Django 1.10. The "
-    "luhn() function is now included in django-localflavor 1.1+.",
-    RemovedInDjango110Warning
-)
-
-LUHN_ODD_LOOKUP = (0, 2, 4, 6, 8, 1, 3, 5, 7, 9)  # sum_of_digits(index * 2)
-
-
-def luhn(candidate):
-    """
-    Checks a candidate number for validity according to the Luhn
-    algorithm (used in validation of, for example, credit cards).
-    Both numeric and string candidates are accepted.
-    """
-    if not isinstance(candidate, six.string_types):
-        candidate = str(candidate)
-    try:
-        evens = sum(int(c) for c in candidate[-1::-2])
-        odds = sum(LUHN_ODD_LOOKUP[int(c)] for c in candidate[-2::-2])
-        return ((evens + odds) % 10 == 0)
-    except ValueError:  # Raised if an int conversion fails
-        return False

tests/utils_tests/test_checksums.py

-import unittest
-
-from django.test import ignore_warnings
-from django.utils.deprecation import RemovedInDjango110Warning
-
-
-class TestUtilsChecksums(unittest.TestCase):
-
-    def check_output(self, function, value, output=None):
-        """
-        Check that function(value) equals output.  If output is None,
-        check that function(value) equals value.
-        """
-        if output is None:
-            output = value
-        self.assertEqual(function(value), output)
-
-    @ignore_warnings(category=RemovedInDjango110Warning)
-    def test_luhn(self):
-        from django.utils import checksums
-        f = checksums.luhn
-        items = (
-            (4111111111111111, True), ('4111111111111111', True),
-            (4222222222222, True), (378734493671000, True),
-            (5424000000000015, True), (5555555555554444, True),
-            (1008, True), ('0000001008', True), ('000000001008', True),
-            (4012888888881881, True), (1234567890123456789012345678909, True),
-            (4111111111211111, False), (42222222222224, False),
-            (100, False), ('100', False), ('0000100', False),
-            ('abc', False), (None, False), (object(), False),
-        )
-        for value, output in items:
-            self.check_output(f, value, output)