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bpo-34427: Fix infinite loop when calling MutableSequence.extend() on self (GH-8813)

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Naris R 2018-08-31 02:56:14 +10:00 • committed by Raymond Hettinger
parent e6dac00779
commit 1b5f9c9653
3 changed files with 15 additions and 0 deletions
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12
Lib/test/test_collections.py
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@ -1721,6 +1721,18 @@ class TestCollectionABCs(ABCTestCase):
mss.clear()
self.assertEqual(len(mss), 0)
# issue 34427
# extending self should not cause infinite loop
items = 'ABCD'
mss2 = MutableSequenceSubclass()
mss2.extend(items + items)
mss.clear()
mss.extend(items)
mss.extend(mss)
self.assertEqual(len(mss), len(mss2))
self.assertEqual(list(mss), list(mss2))
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