[3.11] gh-110196: Fix ipaddress.IPv6Address.__reduce__ (GH-110198) (GH-111190)

(cherry picked from commit 767f416)

Co-authored-by: Tian Gao <[email protected]>

Author: miss-islington

Lib/ipaddress.py

@@ -1941,6 +1941,9 @@ def __eq__(self, other):
             return False
         return self._scope_id == getattr(other, '_scope_id', None)
 
+    def __reduce__(self):
+        return (self.__class__, (str(self),))
+
     @property
     def scope_id(self):
         """Identifier of a particular zone of the address's scope.

Lib/test/test_ipaddress.py

@@ -4,6 +4,7 @@
 """Unittest for ipaddress module."""
 
 
+import copy
 import unittest
 import re
 import contextlib
@@ -542,11 +543,17 @@ def assertBadPart(addr, part):
 
     def test_pickle(self):
         self.pickle_test('2001:db8::')
+        self.pickle_test('2001:db8::%scope')
 
     def test_weakref(self):
         weakref.ref(self.factory('2001:db8::'))
         weakref.ref(self.factory('2001:db8::%scope'))
 
+    def test_copy(self):
+        addr = self.factory('2001:db8::%scope')
+        self.assertEqual(addr, copy.copy(addr))
+        self.assertEqual(addr, copy.deepcopy(addr))
+
 
 class NetmaskTestMixin_v4(CommonTestMixin_v4):
     """Input validation on interfaces and networks is very similar"""

Misc/NEWS.d/next/Library/2023-10-02-05-23-27.gh-issue-110196.djwt0z.rst

@@ -0,0 +1 @@
+Add ``__reduce__`` method to :class:`IPv6Address` in order to keep ``scope_id``