Issue #24206: Fixed __eq__ and __ne__ methods of inspect classes.

3 files changed, 76 insertions, 45 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 45679cf..42f24cd 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -2488,15 +2488,14 @@ class Parameter:
         return hash((self.name, self.kind, self.annotation, self.default))
 
     def __eq__(self, other):
-        return (self is other or
-                    (issubclass(other.__class__, Parameter) and
-                     self._name == other._name and
-                     self._kind == other._kind and
-                     self._default == other._default and
-                     self._annotation == other._annotation))
-
-    def __ne__(self, other):
-        return not self.__eq__(other)
+        if self is other:
+            return True
+        if not isinstance(other, Parameter):
+            return NotImplemented
+        return (self._name == other._name and
+                self._kind == other._kind and
+                self._default == other._default and
+                self._annotation == other._annotation)
 
 
 class BoundArguments:
@@ -2610,13 +2609,12 @@ class BoundArguments:
         self.arguments = OrderedDict(new_arguments)
 
     def __eq__(self, other):
-        return (self is other or
-                    (issubclass(other.__class__, BoundArguments) and
-                     self.signature == other.signature and
-                     self.arguments == other.arguments))
-
-    def __ne__(self, other):
-        return not self.__eq__(other)
+        if self is other:
+            return True
+        if not isinstance(other, BoundArguments):
+            return NotImplemented
+        return (self.signature == other.signature and
+                self.arguments == other.arguments)
 
     def __setstate__(self, state):
         self._signature = state['_signature']
@@ -2775,12 +2773,11 @@ class Signature:
         return hash((params, kwo_params, return_annotation))
 
     def __eq__(self, other):
-        return (self is other or
-                    (isinstance(other, Signature) and
-                     self._hash_basis() == other._hash_basis()))
-
-    def __ne__(self, other):
-        return not self.__eq__(other)
+        if self is other:
+            return True
+        if not isinstance(other, Signature):
+            return NotImplemented
+        return self._hash_basis() == other._hash_basis()
 
     def _bind(self, args, kwargs, *, partial=False):
         """Private method. Don't use directly."""
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index a02f2e1..8e0e73c 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -89,6 +89,9 @@ def gen_coroutine_function_example(self):
     yield
     return 'spam'
 
+class EqualsToAll:
+    def __eq__(self, other):
+        return True
 
 class TestPredicates(IsTestBase):
 
@@ -2672,69 +2675,84 @@ class TestSignatureObject(unittest.TestCase):
 
     def test_signature_equality(self):
         def foo(a, *, b:int) -> float: pass
-        self.assertNotEqual(inspect.signature(foo), 42)
+        self.assertFalse(inspect.signature(foo) == 42)
+        self.assertTrue(inspect.signature(foo) != 42)
+        self.assertTrue(inspect.signature(foo) == EqualsToAll())
+        self.assertFalse(inspect.signature(foo) != EqualsToAll())
 
         def bar(a, *, b:int) -> float: pass
-        self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) == inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) != inspect.signature(bar))
         self.assertEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def bar(a, *, b:int) -> int: pass
-        self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) == inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) != inspect.signature(bar))
         self.assertNotEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def bar(a, *, b:int): pass
-        self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) == inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) != inspect.signature(bar))
         self.assertNotEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def bar(a, *, b:int=42) -> float: pass
-        self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) == inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) != inspect.signature(bar))
         self.assertNotEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def bar(a, *, c) -> float: pass
-        self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) == inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) != inspect.signature(bar))
         self.assertNotEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def bar(a, b:int) -> float: pass
-        self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) == inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) != inspect.signature(bar))
         self.assertNotEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
         def spam(b:int, a) -> float: pass
-        self.assertNotEqual(inspect.signature(spam), inspect.signature(bar))
+        self.assertFalse(inspect.signature(spam) == inspect.signature(bar))
+        self.assertTrue(inspect.signature(spam) != inspect.signature(bar))
         self.assertNotEqual(
             hash(inspect.signature(spam)), hash(inspect.signature(bar)))
 
         def foo(*, a, b, c): pass
         def bar(*, c, b, a): pass
-        self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) == inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) != inspect.signature(bar))
         self.assertEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def foo(*, a=1, b, c): pass
         def bar(*, c, b, a=1): pass
-        self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) == inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) != inspect.signature(bar))
         self.assertEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def foo(pos, *, a=1, b, c): pass
         def bar(pos, *, c, b, a=1): pass
-        self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) == inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) != inspect.signature(bar))
         self.assertEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def foo(pos, *, a, b, c): pass
         def bar(pos, *, c, b, a=1): pass
-        self.assertNotEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) == inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) != inspect.signature(bar))
         self.assertNotEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
         def foo(pos, *args, a=42, b, c, **kwargs:int): pass
         def bar(pos, *args, c, b, a=42, **kwargs:int): pass
-        self.assertEqual(inspect.signature(foo), inspect.signature(bar))
+        self.assertTrue(inspect.signature(foo) == inspect.signature(bar))
+        self.assertFalse(inspect.signature(foo) != inspect.signature(bar))
         self.assertEqual(
             hash(inspect.signature(foo)), hash(inspect.signature(bar)))
 
@@ -2907,11 +2925,17 @@ class TestParameterObject(unittest.TestCase):
         P = inspect.Parameter
         p = P('foo', default=42, kind=inspect.Parameter.KEYWORD_ONLY)
 
-        self.assertEqual(p, p)
-        self.assertNotEqual(p, 42)
+        self.assertTrue(p == p)
+        self.assertFalse(p != p)
+        self.assertFalse(p == 42)
+        self.assertTrue(p != 42)
+        self.assertTrue(p == EqualsToAll())
+        self.assertFalse(p != EqualsToAll())
 
-        self.assertEqual(p, P('foo', default=42,
-                              kind=inspect.Parameter.KEYWORD_ONLY))
+        self.assertTrue(p == P('foo', default=42,
+                               kind=inspect.Parameter.KEYWORD_ONLY))
+        self.assertFalse(p != P('foo', default=42,
+                                kind=inspect.Parameter.KEYWORD_ONLY))
 
     def test_signature_parameter_replace(self):
         p = inspect.Parameter('foo', default=42,
@@ -3215,25 +3239,33 @@ class TestBoundArguments(unittest.TestCase):
     def test_signature_bound_arguments_equality(self):
         def foo(a): pass
         ba = inspect.signature(foo).bind(1)
-        self.assertEqual(ba, ba)
+        self.assertTrue(ba == ba)
+        self.assertFalse(ba != ba)
+        self.assertTrue(ba == EqualsToAll())
+        self.assertFalse(ba != EqualsToAll())
 
         ba2 = inspect.signature(foo).bind(1)
-        self.assertEqual(ba, ba2)
+        self.assertTrue(ba == ba2)
+        self.assertFalse(ba != ba2)
 
         ba3 = inspect.signature(foo).bind(2)
-        self.assertNotEqual(ba, ba3)
+        self.assertFalse(ba == ba3)
+        self.assertTrue(ba != ba3)
         ba3.arguments['a'] = 1
-        self.assertEqual(ba, ba3)
+        self.assertTrue(ba == ba3)
+        self.assertFalse(ba != ba3)
 
         def bar(b): pass
         ba4 = inspect.signature(bar).bind(1)
-        self.assertNotEqual(ba, ba4)
+        self.assertFalse(ba == ba4)
+        self.assertTrue(ba != ba4)
 
         def foo(*, a, b): pass
         sig = inspect.signature(foo)
         ba1 = sig.bind(a=1, b=2)
         ba2 = sig.bind(b=2, a=1)
-        self.assertEqual(ba1, ba2)
+        self.assertTrue(ba1 == ba2)
+        self.assertFalse(ba1 != ba2)
 
     def test_signature_bound_arguments_pickle(self):
         def foo(a, b, *, c:1={}, **kw) -> {42:'ham'}: pass
diff --git a/Misc/NEWS b/Misc/NEWS
index ba01a06..b400a91 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -19,6 +19,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #24206: Fixed __eq__ and __ne__ methods of inspect classes.
+
 - Issue #24631: Fixed regression in the timeit module with multiline setup.
 
 - Issue #18622: unittest.mock.mock_open().reset_mock would recurse infinitely.