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Diffstat (limited to 'Lib/test/test_itertools.py')
| -rw-r--r-- | Lib/test/test_itertools.py | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py index 5b3ba7e297..08c9f3951f 100644 --- a/Lib/test/test_itertools.py +++ b/Lib/test/test_itertools.py @@ -1398,6 +1398,16 @@ class TestExamples(unittest.TestCase): self.assertEqual(list(copy.deepcopy(it)), accumulated[1:]) self.assertEqual(list(copy.copy(it)), accumulated[1:]) + def test_accumulate_reducible_none(self): + # Issue #25718: total is None + it = accumulate([None, None, None], operator.is_) + self.assertEqual(next(it), None) + for proto in range(pickle.HIGHEST_PROTOCOL + 1): + it_copy = pickle.loads(pickle.dumps(it, proto)) + self.assertEqual(list(it_copy), [True, False]) + self.assertEqual(list(copy.deepcopy(it)), [True, False]) + self.assertEqual(list(copy.copy(it)), [True, False]) + def test_chain(self): self.assertEqual(''.join(chain('ABC', 'DEF')), 'ABCDEF') |