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Issue #13454: Fix a crash when deleting an iterator created by itertools.tee()

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if all other iterators were very advanced before.
This commit is contained in:
Serhiy Storchaka 2013-01-25 13:26:55 +02:00
commit c5dadcf2fd
3 changed files with 31 additions and 1 deletions
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8
Lib/test/test_itertools.py
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@ -1267,6 +1267,14 @@ class TestBasicOps(unittest.TestCase):
self.pickletest(a, compare=ans)
self.pickletest(b, compare=ans)
# Issue 13454: Crash when deleting backward iterator from tee()
def test_tee_del_backward(self):
forward, backward = tee(range(20000000))
for i in forward:
pass
del backward
def test_StopIteration(self):
self.assertRaises(StopIteration, next, zip())