# HG changeset patch
# User Franz Glasner <f.glasner@feldmann-mg.com>
# Date 1690977505 -7200
# Node ID 8a560e0c31808ec907c4ecdb296ff05f18c4ecab
# Parent  ea8c2d01a9d978c00e87e7c7e72d4b292ef9004a
Implement __ne__ also where __eq__ is implemented

diff -r ea8c2d01a9d9 -r 8a560e0c3180 data_schema/__init__.py
--- a/data_schema/__init__.py	Wed Aug 02 09:31:49 2023 +0200
+++ b/data_schema/__init__.py	Wed Aug 02 13:58:25 2023 +0200
@@ -237,6 +237,17 @@
                 and (self.cause == other.cause)
                 and (self.index == other.index))
 
+    def __ne__(self, other):
+        #
+        # While the default in Python3 is sensible implementing is recommended
+        # when a built-in __eq__ is overwritten (Raymond Hettinger).
+        #
+        # Do not use not self == other because NotImplemented is not handled
+        # properly in some early Python versions (including Py2).
+        #
+        equal = self.__eq__(other)
+        return NotImplemented if equal is NotImplemented else not equal
+
     def __getstate__(self):
         return (1, self.code, self.severity, self.hint, self.context,
                 self.cause, self.index)