1 files changed, 19 insertions, 22 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."""