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gh-102213: Optimize the performance of __getattr__ (GH-103761)

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Co-authored-by: Kirill <80244920+Eclips4@users.noreply.github.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Co-authored-by: Xiang Wang <34048878+wangxiang-hz@users.noreply.github.com>
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sunmy2019 2023-05-01 18:10:35 +08:00 committed by GitHub
parent 487f55d580
commit 59c27fa5cb
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3 changed files with 28 additions and 8 deletions
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15
Lib/test/test_descr.py
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@ -5004,7 +5004,7 @@ order (MRO) for bases """
self.assertEqual(Parent.__subclasses__(), [])
def test_attr_raise_through_property(self):
# add test case for gh-103272
# test case for gh-103272
class A:
def __getattr__(self, name):
raise ValueError("FOO")
@ -5016,6 +5016,19 @@ order (MRO) for bases """
with self.assertRaisesRegex(ValueError, "FOO"):
A().foo
# test case for gh-103551
class B:
@property
def __getattr__(self, name):
raise ValueError("FOO")
@property
def foo(self):
raise NotImplementedError("BAR")
with self.assertRaisesRegex(NotImplementedError, "BAR"):
B().foo
class DictProxyTests(unittest.TestCase):
def setUp(self):

1
Misc/NEWS.d/next/Core and Builtins/2023-05-01-08-08-05.gh-issue-102213.nfH-4C.rst Normal file
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@ -0,0 +1 @@
Fix performance loss when accessing an object's attributes with ``__getattr__`` defined.

20
Objects/typeobject.c
View File

@ -8306,17 +8306,23 @@ _Py_slot_tp_getattr_hook(PyObject *self, PyObject *name)
if (getattribute == NULL ||
(Py_IS_TYPE(getattribute, &PyWrapperDescr_Type) &&
((PyWrapperDescrObject *)getattribute)->d_wrapped ==
(void *)PyObject_GenericGetAttr))
res = PyObject_GenericGetAttr(self, name);
else {
(void *)PyObject_GenericGetAttr)) {
res = _PyObject_GenericGetAttrWithDict(self, name, NULL, 1);
/* if res == NULL with no exception set, then it must be an
AttributeError suppressed by us. */
if (res == NULL && !PyErr_Occurred()) {
res = call_attribute(self, getattr, name);
}
} else {
Py_INCREF(getattribute);
res = call_attribute(self, getattribute, name);
Py_DECREF(getattribute);
if (res == NULL && PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
res = call_attribute(self, getattr, name);
}
}
if (res == NULL && PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
res = call_attribute(self, getattr, name);
}
Py_DECREF(getattr);
return res;
}