https://hg.python.org/cpython/rev/b4ea00d50e7e changeset: 100804:b4ea00d50e7e parent: 100801:73ce47d4a7b2 parent: 100803:89ba67ee83d6 user: Serhiy Storchaka <storchaka@gmail.com> date: Wed Mar 30 21:01:45 2016 +0300 summary: Issue #26492: Added additional tests for exhausted iterators of mutable sequences. files: Lib/test/list_tests.py | 11 +++++++++++ Lib/test/test_bytes.py | 2 ++ Lib/test/test_iter.py | 11 +++++++++++ 3 files changed, 24 insertions(+), 0 deletions(-) diff --git a/Lib/test/list_tests.py b/Lib/test/list_tests.py --- a/Lib/test/list_tests.py +++ b/Lib/test/list_tests.py @@ -593,3 +593,14 @@ def __iter__(self): raise KeyboardInterrupt self.assertRaises(KeyboardInterrupt, list, F()) + + def test_exhausted_iterator(self): + a = self.type2test([1, 2, 3]) + exhit = iter(a) + empit = iter(a) + for x in exhit: # exhaust the iterator + next(empit) # not exhausted + a.append(9) + self.assertEqual(list(exhit), []) + self.assertEqual(list(empit), [9]) + self.assertEqual(a, self.type2test([1, 2, 3, 9])) diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py --- a/Lib/test/test_bytes.py +++ b/Lib/test/test_bytes.py @@ -17,6 +17,7 @@ import test.support import test.string_tests import test.buffer_tests +import test.list_tests from test.support import bigaddrspacetest, MAX_Py_ssize_t @@ -1418,6 +1419,7 @@ b[:] = data self.assertEqual(list(it), []) + test_exhausted_iterator = test.list_tests.CommonTest.test_exhausted_iterator class AssortedBytesTest(unittest.TestCase): # diff --git a/Lib/test/test_iter.py b/Lib/test/test_iter.py --- a/Lib/test/test_iter.py +++ b/Lib/test/test_iter.py @@ -190,6 +190,17 @@ self.assertTrue(isinstance(it, collections.abc.Iterator)) self.assertEqual(list(it), []) + def test_mutating_seq_class_exhausted_iter(self): + a = SequenceClass(5) + exhit = iter(a) + empit = iter(a) + for x in exhit: # exhaust the iterator + next(empit) # not exhausted + a.n = 7 + self.assertEqual(list(exhit), []) + self.assertEqual(list(empit), [5, 6]) + self.assertEqual(list(a), [0, 1, 2, 3, 4, 5, 6]) + # Test a new_style class with __iter__ but no next() method def test_new_style_iter_class(self): class IterClass(object): -- Repository URL: https://hg.python.org/cpython