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bpo-44606: Fix __instancecheck__ and __subclasscheck__ for the union type. (GH-27120)

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* Fix issubclass() for None.
  E.g. issubclass(type(None), int | None) returns now True.
* Fix issubclass() for virtual subclasses.
  E.g. issubclass(dict, int | collections.abc.Mapping) returns now True.
* Fix crash in isinstance() if the check for one of items raises exception.
(cherry picked from commit 81989058de)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2021-07-13 21:55:45 -07:00 • committed by GitHub
parent bb260c2a21
commit b42eee78e7
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 55 additions and 6 deletions
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23
Objects/unionobject.c
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@ -67,8 +67,14 @@ union_instancecheck(PyObject *self, PyObject *instance)
if (arg == Py_None) {
arg = (PyObject *)&_PyNone_Type;
}
if (PyType_Check(arg) && PyObject_IsInstance(instance, arg) != 0) {
Py_RETURN_TRUE;
if (PyType_Check(arg)) {
int res = PyObject_IsInstance(instance, arg);
if (res < 0) {
return NULL;
}
if (res) {
Py_RETURN_TRUE;
}
}
}
Py_RETURN_FALSE;
@ -90,8 +96,17 @@ union_subclasscheck(PyObject *self, PyObject *instance)
Py_ssize_t nargs = PyTuple_GET_SIZE(alias->args);
for (Py_ssize_t iarg = 0; iarg < nargs; iarg++) {
PyObject *arg = PyTuple_GET_ITEM(alias->args, iarg);
if (PyType_Check(arg) && (PyType_IsSubtype((PyTypeObject *)instance, (PyTypeObject *)arg) != 0)) {
Py_RETURN_TRUE;
if (arg == Py_None) {
arg = (PyObject *)&_PyNone_Type;
}
if (PyType_Check(arg)) {
int res = PyObject_IsSubclass(instance, arg);
if (res < 0) {
return NULL;
}
if (res) {
Py_RETURN_TRUE;
}
}
}
Py_RETURN_FALSE;