bpo-41780: Fix __dir__ of types.GenericAlias (GH-22262)
Automerge-Triggered-By: @gvanrossum
diff --git a/Lib/test/test_genericalias.py b/Lib/test/test_genericalias.py
index 1f24469..643fffc 100644
--- a/Lib/test/test_genericalias.py
+++ b/Lib/test/test_genericalias.py
@@ -287,6 +287,11 @@
self.assertEqual(a.__args__, (list[T], tuple[T, ...]))
self.assertEqual(a.__parameters__, (T,))
+ def test_dir(self):
+ dir_of_gen_alias = set(dir(list[int]))
+ self.assertTrue(dir_of_gen_alias.issuperset(dir(list)))
+ for generic_alias_property in ("__origin__", "__args__", "__parameters__"):
+ self.assertIn(generic_alias_property, dir_of_gen_alias)
if __name__ == "__main__":
unittest.main()
diff --git a/Misc/NEWS.d/next/Core and Builtins/2020-09-15-23-29-49.bpo-41780.bOBUIH.rst b/Misc/NEWS.d/next/Core and Builtins/2020-09-15-23-29-49.bpo-41780.bOBUIH.rst
new file mode 100644
index 0000000..9a7594f
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2020-09-15-23-29-49.bpo-41780.bOBUIH.rst
@@ -0,0 +1,2 @@
+Fix :meth:`__dir__` of :class:`types.GenericAlias`. Patch by Batuhan
+Taskaya.
diff --git a/Objects/genericaliasobject.c b/Objects/genericaliasobject.c
index 87bd1ae..ab56e1c 100644
--- a/Objects/genericaliasobject.c
+++ b/Objects/genericaliasobject.c
@@ -487,11 +487,50 @@
alias->origin, alias->args);
}
+static PyObject *
+ga_dir(PyObject *self, PyObject *Py_UNUSED(ignored))
+{
+ gaobject *alias = (gaobject *)self;
+ PyObject *dir = PyObject_Dir(alias->origin);
+ if (dir == NULL) {
+ return NULL;
+ }
+
+ PyObject *dir_entry = NULL;
+ for (const char * const *p = attr_exceptions; ; p++) {
+ if (*p == NULL) {
+ break;
+ }
+ else {
+ dir_entry = PyUnicode_FromString(*p);
+ if (dir_entry == NULL) {
+ goto error;
+ }
+ int contains = PySequence_Contains(dir, dir_entry);
+ if (contains < 0) {
+ goto error;
+ }
+ if (contains == 0 && PyList_Append(dir, dir_entry) < 0) {
+ goto error;
+ }
+
+ Py_CLEAR(dir_entry);
+ }
+ }
+ return dir;
+
+error:
+ Py_DECREF(dir);
+ Py_XDECREF(dir_entry);
+ return NULL;
+}
+
static PyMethodDef ga_methods[] = {
{"__mro_entries__", ga_mro_entries, METH_O},
{"__instancecheck__", ga_instancecheck, METH_O},
{"__subclasscheck__", ga_subclasscheck, METH_O},
{"__reduce__", ga_reduce, METH_NOARGS},
+ {"__dir__", ga_dir, METH_NOARGS},
{0}
};