bpo-42035: Add a PyType_GetQualName() to get type's qualified name.

Doc/c-api/type.rst

@@ -112,6 +112,13 @@ Type Objects
 
    .. versionadded:: 3.11
 
+.. c:function:: PyObject* PyType_GetQualName(PyTypeObject *type)
+
+   Return the type's qualified name. Equivalent to getting the
+   type's ``__qualname__`` attribute.
+
+   .. versionadded:: 3.11
+
 .. c:function:: void* PyType_GetSlot(PyTypeObject *type, int slot)
 
    Return the function pointer stored in the given slot. If the

Doc/data/refcounts.dat

@@ -2292,6 +2292,9 @@ PyType_GetFlags:PyTypeObject*:type:0:
 PyType_GetName:PyObject*::+1:
 PyType_GetName:PyTypeObject*:type:0:
 
+PyType_GetQualName:PyObject*::+1:
+PyType_GetQualName:PyTypeObject*:type:0:
+
 PyType_GetSlot:void*:::
 PyType_GetSlot:PyTypeObject*:type:0:
 PyType_GetSlot:int:slot::

Doc/data/stable_abi.dat

@@ -640,6 +640,7 @@ function,PyType_GetFlags,3.2,
 function,PyType_GetModule,3.10,
 function,PyType_GetModuleState,3.10,
 function,PyType_GetName,3.11,
+function,PyType_GetQualName,3.11,
 function,PyType_GetSlot,3.4,
 function,PyType_IsSubtype,3.2,
 function,PyType_Modified,3.2,

Doc/whatsnew/3.11.rst

@@ -298,6 +298,9 @@ C API Changes
 * Add a new :c:func:`PyType_GetName` function to get type's short name.
   (Contributed by Hai Shi in :issue:`42035`.)
 
+* Add a new :c:func:`PyType_GetQualName` function to get type's qualified name.
+  (Contributed by Hai Shi in :issue:`42035`.)
+
 New Features
 ------------
 

Include/object.h

@@ -241,6 +241,7 @@ PyAPI_FUNC(void *) PyType_GetModuleState(struct _typeobject *);
 #endif
 #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030B0000
 PyAPI_FUNC(PyObject *) PyType_GetName(PyTypeObject *);
+PyAPI_FUNC(PyObject *) PyType_GetQualName(PyTypeObject *);
 #endif
 
 /* Generic type check */

Misc/NEWS.d/next/C API/2021-08-02-20-49-36.bpo-42035.HTBcZt.rst

@@ -0,0 +1,2 @@
+Add a new :c:func:`PyType_GetQualName` function to get type's qualified
+name.

Misc/stable_abi.txt

@@ -2136,6 +2136,8 @@ function PyGC_IsEnabled
 
 function PyType_GetName
     added 3.11
+function PyType_GetQualName
+    added 3.11
 
 # (Detailed comments aren't really needed for further entries: from here on
 #  we can use version control logs.)

Modules/_testcapimodule.c

@@ -1159,6 +1159,46 @@ test_get_type_name(PyObject *self, PyObject *Py_UNUSED(ignored))
 }
 
 
+static PyObject *
+test_get_type_qualname(PyObject *self, PyObject *Py_UNUSED(ignored))
+{
+    PyObject *tp_qualname = PyType_GetQualName(&PyLong_Type);
+    assert(strcmp(PyUnicode_AsUTF8(tp_qualname), "int") == 0);
+    Py_DECREF(tp_qualname);
+
+    tp_qualname = PyType_GetQualName(&_PyNamespace_Type);
+    assert(strcmp(PyUnicode_AsUTF8(tp_qualname), "SimpleNamespace") == 0);
+    Py_DECREF(tp_qualname);
+
+    PyObject *HeapTypeNameType = PyType_FromSpec(&HeapTypeNameType_Spec);
+    if (HeapTypeNameType == NULL) {
+        Py_RETURN_NONE;
+    }
+    tp_qualname = PyType_GetQualName((PyTypeObject *)HeapTypeNameType);
+    assert(strcmp(PyUnicode_AsUTF8(tp_qualname), "HeapTypeNameType") == 0);
+    Py_DECREF(tp_qualname);
+
+    PyObject *spec_name = PyUnicode_FromString(HeapTypeNameType_Spec.name);
+    if (spec_name == NULL) {
+        goto done;
+    }
+    if (PyObject_SetAttrString(HeapTypeNameType,
+                               "__qualname__", spec_name) < 0) {
+        Py_DECREF(spec_name);
+        goto done;
+    }
+    tp_qualname = PyType_GetQualName((PyTypeObject *)HeapTypeNameType);
+    assert(strcmp(PyUnicode_AsUTF8(tp_qualname),
+                  "_testcapi.HeapTypeNameType") == 0);
+    Py_DECREF(spec_name);
+    Py_DECREF(tp_qualname);
+
+  done:
+    Py_DECREF(HeapTypeNameType);
+    Py_RETURN_NONE;
+}
+
+
 static PyObject *
 get_args(PyObject *self, PyObject *args)
 {
@@ -5650,6 +5690,7 @@ static PyMethodDef TestMethods[] = {
     {"get_args",                get_args,                        METH_VARARGS},
     {"test_get_statictype_slots", test_get_statictype_slots,     METH_NOARGS},
     {"test_get_type_name",        test_get_type_name,            METH_NOARGS},
+    {"test_get_type_qualname",   test_get_type_qualname,       METH_NOARGS},
     {"get_kwargs", (PyCFunction)(void(*)(void))get_kwargs,
       METH_VARARGS|METH_KEYWORDS},
     {"getargs_tuple",           getargs_tuple,                   METH_VARARGS},

Objects/typeobject.c

@@ -3634,6 +3634,12 @@ PyType_GetName(PyTypeObject *type)
     return type_name(type, NULL);
 }
 
+PyObject *
+PyType_GetQualName(PyTypeObject *type)
+{
+    return type_qualname(type, NULL);
+}
+
 void *
 PyType_GetSlot(PyTypeObject *type, int slot)
 {

PC/python3dll.c

@@ -589,6 +589,7 @@ EXPORT_FUNC(PyType_GetFlags)
 EXPORT_FUNC(PyType_GetModule)
 EXPORT_FUNC(PyType_GetModuleState)
 EXPORT_FUNC(PyType_GetName)
+EXPORT_FUNC(PyType_GetQualName)
 EXPORT_FUNC(PyType_GetSlot)
 EXPORT_FUNC(PyType_IsSubtype)
 EXPORT_FUNC(PyType_Modified)