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Issue #25718: Fixed pickling and copying the accumulate() iterator with total is None.

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This commit is contained in:
Serhiy Storchaka 2016-03-06 14:02:26 +02:00
commit 5608411a96
3 changed files with 30 additions and 0 deletions
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10
Lib/test/test_itertools.py
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@ -1448,6 +1448,16 @@ 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')