pythongh-119180: Use equality when comparing against annotationlib.Format (python#131755)

Author: Viicos

Lib/test/test_annotationlib.py

@@ -517,7 +517,7 @@ def foo(a: int, b: str):
 
         foo.__annotations__ = {"a": "foo", "b": "str"}
         for format in Format:
-            if format is Format.VALUE_WITH_FAKE_GLOBALS:
+            if format == Format.VALUE_WITH_FAKE_GLOBALS:
                 continue
             with self.subTest(format=format):
                 self.assertEqual(
@@ -816,7 +816,7 @@ def __annotations__(self):
 
         wa = WeirdAnnotations()
         for format in Format:
-            if format is Format.VALUE_WITH_FAKE_GLOBALS:
+            if format == Format.VALUE_WITH_FAKE_GLOBALS:
                 continue
             with (
                 self.subTest(format=format),

Lib/test/test_typing.py

@@ -7158,6 +7158,8 @@ class C:
 
         self.assertEqual(get_type_hints(C, format=annotationlib.Format.STRING),
                          {'x': 'undefined'})
+        # Make sure using an int as format also works:
+        self.assertEqual(get_type_hints(C, format=4), {'x': 'undefined'})
 
     def test_get_type_hints_format_function(self):
         def func(x: undefined) -> undefined: ...

Lib/typing.py

@@ -2315,7 +2315,7 @@ def get_type_hints(obj, globalns=None, localns=None, include_extras=False,
         hints = {}
         for base in reversed(obj.__mro__):
             ann = annotationlib.get_annotations(base, format=format)
-            if format is annotationlib.Format.STRING:
+            if format == annotationlib.Format.STRING:
                 hints.update(ann)
                 continue
             if globalns is None:
@@ -2339,7 +2339,7 @@ def get_type_hints(obj, globalns=None, localns=None, include_extras=False,
                 value = _eval_type(value, base_globals, base_locals, base.__type_params__,
                                    format=format, owner=obj)
                 hints[name] = value
-        if include_extras or format is annotationlib.Format.STRING:
+        if include_extras or format == annotationlib.Format.STRING:
             return hints
         else:
             return {k: _strip_annotations(t) for k, t in hints.items()}
@@ -2353,7 +2353,7 @@ def get_type_hints(obj, globalns=None, localns=None, include_extras=False,
         and not hasattr(obj, '__annotate__')
     ):
         raise TypeError(f"{obj!r} is not a module, class, or callable.")
-    if format is annotationlib.Format.STRING:
+    if format == annotationlib.Format.STRING:
         return hints
 
     if globalns is None: