Issue #14010: Fix a crash when iterating or deleting deeply nested filters
(builting and in itertools module, i.e. map(), itertools.chain(), etc).
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index 53926a9..5d5d8a6 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -1809,6 +1809,121 @@
self.assertNotIn("does not take keyword arguments", err.args[0])
+class TestRecursionLimit(unittest.TestCase):
+ # Issue #14010
+ recursionlimit = sys.getrecursionlimit()
+
+ def test_accumulate(self):
+ it = (0, 1)
+ for _ in range(self.recursionlimit):
+ it = accumulate(it)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_chain(self):
+ it = (0, 1)
+ for _ in range(self.recursionlimit):
+ it = chain(it, ())
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_compress(self):
+ data = (0, 1)
+ selectors = (True, True)
+ it = data
+ for _ in range(self.recursionlimit):
+ it = compress(it, selectors)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ it = selectors
+ for _ in range(self.recursionlimit):
+ it = compress(data, it)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_cycle(self):
+ it = (0, 1)
+ for _ in range(self.recursionlimit):
+ it = cycle(it)
+ with self.assertRaises(RuntimeError):
+ for _ in range(3):
+ next(it)
+ del it
+
+ def test_dropwhile(self):
+ it = (0, 1, 0)
+ for _ in range(self.recursionlimit):
+ it = dropwhile(bool, it)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_filterfalse(self):
+ it = (0, 1)
+ for _ in range(self.recursionlimit):
+ it = filterfalse(bool, it)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_groupby(self):
+ key = operator.itemgetter(0)
+ it = ((0, []), (1, []))
+ for _ in range(self.recursionlimit):
+ it = groupby(it, key)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_islice(self):
+ it = (0, 1)
+ for _ in range(self.recursionlimit):
+ it = islice(it, 2)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_starmap(self):
+ it = 'ab'
+ for _ in range(self.recursionlimit):
+ it = starmap(tuple, it)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_takewhile(self):
+ it = (1, 0)
+ for _ in range(self.recursionlimit):
+ it = takewhile(bool, it)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+ def test_zip_longest(self):
+ it = (0, 1)
+ for _ in range(self.recursionlimit):
+ it = zip_longest(it)
+ with self.assertRaises(RuntimeError):
+ for _ in it:
+ pass
+ del it
+
+
libreftest = """ Doctest for examples in the library reference: libitertools.tex
@@ -2043,7 +2158,7 @@
def test_main(verbose=None):
test_classes = (TestBasicOps, TestVariousIteratorArgs, TestGC,
RegressionTests, LengthTransparency,
- SubclassWithKwargsTest, TestExamples)
+ SubclassWithKwargsTest, TestExamples, TestRecursionLimit)
support.run_unittest(*test_classes)
# verify reference counting