apply petr's comment

Author: shihai1991

Doc/c-api/type.rst

@@ -97,7 +97,9 @@ Type Objects
 
 .. c:function:: const char* PyType_GetName(PyTypeObject *type)
 
-   Return the type's name.
+   Return the type's name. The returned pointer includes the module name
+   if type's name have a prefix of module name.
+   Callers can hold this pointer until the type has been deallocated.
 
    .. versionadded:: 3.10
 

Modules/_testcapimodule.c

@@ -1089,7 +1089,7 @@ test_get_type_name(PyObject *self, PyObject *Py_UNUSED(ignored))
         Py_RETURN_NONE;
     }
     tp_name = PyType_GetName((PyTypeObject *)HeapTypeNameType);
-    assert(strcmp(tp_name, "HeapTypeNameType") == 0);
+    assert(strcmp(tp_name, "_testcapi.HeapTypeNameType") == 0);
 
     Py_DECREF(HeapTypeNameType);
     Py_RETURN_NONE;

Objects/typeobject.c

@@ -3157,10 +3157,10 @@ PyType_GetName(PyTypeObject *type)
 {
     assert(PyType_Check(type));
     if (_PyType_HasFeature(type, Py_TPFLAGS_HEAPTYPE)) {
-        return PyUnicode_AsUTF8(((PyHeapTypeObject *)type)->ht_name);
-    } else {
-        return type->tp_name;
+        PyTypeObject ht_type = ((PyHeapTypeObject *)type)->ht_type;
+        return ht_type.tp_name;
     }
+    return type->tp_name;
 }
 
 void *