fix 3.12

python · Jun 16, 2023 · f4adac5 · f4adac5
1 parent 4f2b790
commit f4adac5
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 4 deletions.
diff --git a/src/test_typing_extensions.py b/src/test_typing_extensions.py
@@ -4842,10 +4842,10 @@ def test_typing_extensions_defers_when_possible(self):
             exclude |= {
                 'Protocol', 'SupportsAbs', 'SupportsBytes',
                 'SupportsComplex', 'SupportsFloat', 'SupportsIndex', 'SupportsInt',
-                'SupportsRound', 'is_typeddict', 'Unpack',
+                'SupportsRound', 'Unpack',
             }
         if sys.version_info < (3, 13):
-            exclude |= {'NamedTuple', 'TypedDict'}
+            exclude |= {'NamedTuple', 'TypedDict', 'is_typeddict'}
         for item in typing_extensions.__all__:
             if item not in exclude and hasattr(typing, item):
                 self.assertIs(

diff --git a/src/typing_extensions.py b/src/typing_extensions.py
@@ -2643,8 +2643,11 @@ def __new__(cls, typename, bases, ns):
             )
             nm_tpl.__bases__ = bases
             if typing.Generic in bases:
-                class_getitem = typing.Generic.__class_getitem__.__func__
-                nm_tpl.__class_getitem__ = classmethod(class_getitem)
+                if hasattr(typing, '_generic_class_getitem'):  # 3.12+
+                    nm_tpl.__class_getitem__ = classmethod(typing._generic_class_getitem)
+                else:
+                    class_getitem = typing.Generic.__class_getitem__.__func__
+                    nm_tpl.__class_getitem__ = classmethod(class_getitem)
             # update from user namespace without overriding special namedtuple attributes
             for key in ns:
                 if key in _prohibited_namedtuple_fields: