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gh-107810: Improve DeprecationWarning for metaclasses with custom tp_new (GH-107834)

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Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>
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Marc Mueller 2023-08-10 17:55:47 +02:00 • committed by GitHub
parent e4275f4df3
commit 16dcce2176
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3 changed files with 5 additions and 4 deletions
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2
Lib/test/test_capi/test_misc.py
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@ -611,7 +611,7 @@ class CAPITest(unittest.TestCase):
# Class creation from C # Class creation from C
with warnings_helper.check_warnings( with warnings_helper.check_warnings(
('.*custom tp_new.*in Python 3.14.*', DeprecationWarning), ('.* _testcapi.Subclass .* custom tp_new.*in Python 3.14.*', DeprecationWarning),
): ):
sub = _testcapi.make_type_with_base(Base) sub = _testcapi.make_type_with_base(Base)
self.assertTrue(issubclass(sub, Base)) self.assertTrue(issubclass(sub, Base))

1
Misc/NEWS.d/next/C API/2023-08-10-11-12-25.gh-issue-107810.oJ40Qx.rst Normal file
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@ -0,0 +1 @@
Improve :exc:`DeprecationWarning` for uses of :c:type:`PyType_Spec` with metaclasses that have custom ``tp_new``.

6
Objects/typeobject.c
View file

@ -4264,9 +4264,9 @@ _PyType_FromMetaclass_impl(
if (_allow_tp_new) { if (_allow_tp_new) {
if (PyErr_WarnFormat( if (PyErr_WarnFormat(
PyExc_DeprecationWarning, 1, PyExc_DeprecationWarning, 1,
"Using PyType_Spec with metaclasses that have custom " "Type %s uses PyType_Spec with a metaclass that has custom "
"tp_new is deprecated and will no longer be allowed in " "tp_new. This is deprecated and will no longer be allowed in "
"Python 3.14.") < 0) { "Python 3.14.", spec->name) < 0) {
goto finally; goto finally;
} }
} }