From 3fbf5c6427c260eab41c37f6eb7f66b79ab4ea88 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 16 Jun 2022 20:56:20 -0700
Subject: gh-93820: Fix copy() regression in enum.Flag (GH-93876) (#93886)

GH-26658 introduced a regression in copy / pickle protocol for combined
`enum.Flag`s. `copy.copy(re.A | re.I)` would fail with
`AttributeError: ASCII|IGNORECASE`.

`enum.Flag` now has a `__reduce_ex__()` method that reduces flags by
combined value, not by combined name.
(cherry picked from commit 05b32c1c796d6c80479756ae898f488eac5f4f71)

Co-authored-by: Christian Heimes <christian@python.org>

Co-authored-by: Christian Heimes <christian@python.org>
---
 Lib/enum.py                                        |  3 +++
 Lib/test/test_enum.py                              | 28 ++++++++++++++++++++++
 .../2022-06-15-21-20-02.gh-issue-93820.FAMLY8.rst  |  2 ++
 3 files changed, 33 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2022-06-15-21-20-02.gh-issue-93820.FAMLY8.rst

diff --git a/Lib/enum.py b/Lib/enum.py
index fe521b1..091acb3 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -1372,6 +1372,9 @@ class Flag(Enum, boundary=STRICT):
     Support for flags
     """
 
+    def __reduce_ex__(self, proto):
+        return self.__class__, (self._value_, )
+
     _numeric_repr_ = repr
 
     def _generate_next_value_(name, start, count, last_values):
diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index 56cebfe..b44c566 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -1,3 +1,4 @@
+import copy
 import enum
 import doctest
 import inspect
@@ -732,6 +733,13 @@ class _MinimalOutputTests:
             self.assertFormatIsValue('{:5.2}', TE.third)
             self.assertFormatIsValue('{:f}', TE.third)
 
+    def test_copy(self):
+        TE = self.MainEnum
+        copied = copy.copy(TE)
+        self.assertEqual(copied, TE)
+        deep = copy.deepcopy(TE)
+        self.assertEqual(deep, TE)
+
 
 class _FlagTests:
 
@@ -2652,6 +2660,26 @@ class TestSpecial(unittest.TestCase):
         self.assertTrue(isinstance(MyIntFlag.ONE | MyIntFlag.TWO, MyIntFlag), MyIntFlag.ONE | MyIntFlag.TWO)
         self.assertTrue(isinstance(MyIntFlag.ONE | 2, MyIntFlag))
 
+    def test_int_flags_copy(self):
+        class MyIntFlag(IntFlag):
+            ONE = 1
+            TWO = 2
+            FOUR = 4
+
+        flags = MyIntFlag.ONE | MyIntFlag.TWO
+        copied = copy.copy(flags)
+        deep = copy.deepcopy(flags)
+        self.assertEqual(copied, flags)
+        self.assertEqual(deep, flags)
+
+        flags = MyIntFlag.ONE | MyIntFlag.TWO | 8
+        copied = copy.copy(flags)
+        deep = copy.deepcopy(flags)
+        self.assertEqual(copied, flags)
+        self.assertEqual(deep, flags)
+        self.assertEqual(copied.value, 1 | 2 | 8)
+
+
 class TestOrder(unittest.TestCase):
     "test usage of the `_order_` attribute"
 
diff --git a/Misc/NEWS.d/next/Library/2022-06-15-21-20-02.gh-issue-93820.FAMLY8.rst b/Misc/NEWS.d/next/Library/2022-06-15-21-20-02.gh-issue-93820.FAMLY8.rst
new file mode 100644
index 0000000..e06d897
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-06-15-21-20-02.gh-issue-93820.FAMLY8.rst
@@ -0,0 +1,2 @@
+Fixed a regression when :func:`copy.copy`-ing :class:`enum.Flag` with
+multiple flag members.
-- 
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