bpo-43908: Make re types immutable (GH-25697)
Co-authored-by: Victor Stinner <vstinner@python.org>
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index bd68958..96d0cdb 100644
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -2190,6 +2190,18 @@ class ImplementationTest(unittest.TestCase):
Test implementation details of the re module.
"""
+ @cpython_only
+ def test_immutable(self):
+ # bpo-43908: check that re types are immutable
+ with self.assertRaises(TypeError):
+ re.Match.foo = 1
+ with self.assertRaises(TypeError):
+ re.Pattern.foo = 1
+ with self.assertRaises(TypeError):
+ pat = re.compile("")
+ tp = type(pat.scanner(""))
+ tp.foo = 1
+
def test_overlap_table(self):
f = sre_compile._generate_overlap_table
self.assertEqual(f(""), [])