Issue #14385: Support other types than dict for __builtins__

It is now possible to use a custom type for the __builtins__ namespace, instead
of a dict. It can be used for sandboxing for example.  Raise also a NameError
instead of ImportError if __build_class__ name if not found in __builtins__.

1 files changed, 2 insertions, 4 deletions

diff --git a/Objects/frameobject.c b/Objects/frameobject.c
index c8b8b1d..6208556 100644
--- a/Objects/frameobject.c
+++ b/Objects/frameobject.c
@@ -614,10 +614,8 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
         if (builtins) {
             if (PyModule_Check(builtins)) {
                 builtins = PyModule_GetDict(builtins);
-                assert(!builtins || PyDict_Check(builtins));
+                assert(builtins != NULL);
             }
-            else if (!PyDict_Check(builtins))
-                builtins = NULL;
         }
         if (builtins == NULL) {
             /* No builtins!              Make up a minimal one
@@ -636,7 +634,7 @@ PyFrame_New(PyThreadState *tstate, PyCodeObject *code, PyObject *globals,
         /* If we share the globals, we share the builtins.
            Save a lookup and a call. */
         builtins = back->f_builtins;
-        assert(builtins != NULL && PyDict_Check(builtins));
+        assert(builtins != NULL);
         Py_INCREF(builtins);
     }
     if (code->co_zombieframe != NULL) {