ParamSpec: backport bpo-46676 (#1059)

Author: GBeauregard

CHANGELOG

@@ -1,5 +1,7 @@
 # Release 4.x.x
 
+- `ParamSpec` args and kwargs are now equal to themselves. Backport from
+  bpo-46676. Patch by Gregory Beauregard (@GBeauregard).
 - Add `reveal_type`. Backport from bpo-46414.
 - Runtime support for PEP 681 and `typing_extensions.dataclass_transform`.
 - `Annotated` can now wrap `ClassVar` and `Final`. Backport from

src/test_typing_extensions.py

@@ -2057,15 +2057,24 @@ def test_valid_uses(self):
         self.assertTrue(hasattr(P, 'args'))
         self.assertTrue(hasattr(P, 'kwargs'))
 
+    @skipIf((3, 10, 0) <= sys.version_info[:3] <= (3, 10, 2), "Needs bpo-46676.")
     def test_args_kwargs(self):
         P = ParamSpec('P')
+        P_2 = ParamSpec('P_2')
         # Note: not in dir(P) because of __class__ hacks
         self.assertTrue(hasattr(P, 'args'))
         self.assertTrue(hasattr(P, 'kwargs'))
         self.assertIsInstance(P.args, ParamSpecArgs)
         self.assertIsInstance(P.kwargs, ParamSpecKwargs)
         self.assertIs(P.args.__origin__, P)
         self.assertIs(P.kwargs.__origin__, P)
+        self.assertEqual(P.args, P.args)
+        self.assertEqual(P.kwargs, P.kwargs)
+        self.assertNotEqual(P.args, P_2.args)
+        self.assertNotEqual(P.kwargs, P_2.kwargs)
+        self.assertNotEqual(P.args, P.kwargs)
+        self.assertNotEqual(P.kwargs, P.args)
+        self.assertNotEqual(P.args, P_2.kwargs)
         self.assertEqual(repr(P.args), "P.args")
         self.assertEqual(repr(P.kwargs), "P.kwargs")
 

src/typing_extensions.py

@@ -1635,6 +1635,11 @@ def __init__(self, origin):
         def __repr__(self):
             return f"{self.__origin__.__name__}.args"
 
+        def __eq__(self, other):
+            if not isinstance(other, ParamSpecArgs):
+                return NotImplemented
+            return self.__origin__ == other.__origin__
+
     class ParamSpecKwargs(_Immutable):
         """The kwargs for a ParamSpec object.
 
@@ -1653,6 +1658,11 @@ def __init__(self, origin):
         def __repr__(self):
             return f"{self.__origin__.__name__}.kwargs"
 
+        def __eq__(self, other):
+            if not isinstance(other, ParamSpecKwargs):
+                return NotImplemented
+            return self.__origin__ == other.__origin__
+
 # 3.10+
 if hasattr(typing, 'ParamSpec'):
     ParamSpec = typing.ParamSpec