GH-103699: Add `__orig_bases__` to various typing classes (#103698)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/Lib/typing.py b/Lib/typing.py
index 7c16556..354bc80 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -2962,7 +2962,9 @@ def NamedTuple(typename, fields=None, /, **kwargs):
     elif kwargs:
         raise TypeError("Either list of fields or keywords"
                         " can be provided to NamedTuple, not both")
-    return _make_nmtuple(typename, fields, module=_caller())
+    nt = _make_nmtuple(typename, fields, module=_caller())
+    nt.__orig_bases__ = (NamedTuple,)
+    return nt
 
 _NamedTuple = type.__new__(NamedTupleMeta, 'NamedTuple', (), {})
 
@@ -2994,6 +2996,9 @@ class _TypedDictMeta(type):
 
         tp_dict = type.__new__(_TypedDictMeta, name, (*generic_base, dict), ns)
 
+        if not hasattr(tp_dict, '__orig_bases__'):
+            tp_dict.__orig_bases__ = bases
+
         annotations = {}
         own_annotations = ns.get('__annotations__', {})
         msg = "TypedDict('Name', {f0: t0, f1: t1, ...}); each t must be a type"
@@ -3104,7 +3109,9 @@ def TypedDict(typename, fields=None, /, *, total=True, **kwargs):
         # Setting correct module is necessary to make typed dict classes pickleable.
         ns['__module__'] = module
 
-    return _TypedDictMeta(typename, (), ns, total=total)
+    td = _TypedDictMeta(typename, (), ns, total=total)
+    td.__orig_bases__ = (TypedDict,)
+    return td
 
 _TypedDict = type.__new__(_TypedDictMeta, 'TypedDict', (), {})
 TypedDict.__mro_entries__ = lambda bases: (_TypedDict,)