gh-108000: Test that lambda also has __type_params__ (#108002)

Author: sobolevn

Lib/test/test_funcattrs.py

@@ -194,16 +194,19 @@ def test___qualname__(self):
     def test___type_params__(self):
         def generic[T](): pass
         def not_generic(): pass
+        lambda_ = lambda: ...
         T, = generic.__type_params__
         self.assertIsInstance(T, typing.TypeVar)
         self.assertEqual(generic.__type_params__, (T,))
-        self.assertEqual(not_generic.__type_params__, ())
-        with self.assertRaises(TypeError):
-            del not_generic.__type_params__
-        with self.assertRaises(TypeError):
-            not_generic.__type_params__ = 42
-        not_generic.__type_params__ = (T,)
-        self.assertEqual(not_generic.__type_params__, (T,))
+        for func in (not_generic, lambda_):
+            with self.subTest(func=func):
+                self.assertEqual(func.__type_params__, ())
+                with self.assertRaises(TypeError):
+                    del func.__type_params__
+                with self.assertRaises(TypeError):
+                    func.__type_params__ = 42
+                func.__type_params__ = (T,)
+                self.assertEqual(func.__type_params__, (T,))
 
     def test___code__(self):
         num_one, num_two = 7, 8