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GH-94254: Make _struct module types immutable (GH-94269)

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(cherry picked from commit 17ed560fcd)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
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Miss Islington (bot) 2022-06-26 03:45:00 -07:00 • committed by GitHub
parent 4b1144ced1
commit c481cd6256
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3 changed files with 17 additions and 2 deletions
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12
Lib/test/test_struct.py
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@ -689,6 +689,18 @@ class StructTest(unittest.TestCase):
self.assertIsNone(
module_ref(), "_struct module was not garbage collected")
@support.cpython_only
def test__struct_types_immutable(self):
# See https://github.com/python/cpython/issues/94254
Struct = struct.Struct
unpack_iterator = type(struct.iter_unpack("b", b'x'))
for cls in (Struct, unpack_iterator):
with self.subTest(cls=cls):
with self.assertRaises(TypeError):
cls.x = 1
def test_issue35714(self):
# Embedded null characters should not be allowed in format strings.
for s in '\0', '2\0i', b'\0':