From 51863b7d6ea183167da09fc6b3f2745a1aaa4ef5 Mon Sep 17 00:00:00 2001
From: Alex Waygood <Alex.Waygood@Gmail.com>
Date: Sat, 23 Sep 2023 19:31:17 +0100
Subject: [PATCH] gh-109653: Improve `enum` import time by avoiding import of
 `functools` (GH-109789)

---
 Lib/enum.py                                                  | 5 ++---
 .../Library/2023-09-23-12-47-45.gh-issue-109653.9wZBfs.rst   | 1 +
 2 files changed, 3 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-09-23-12-47-45.gh-issue-109653.9wZBfs.rst

diff --git a/Lib/enum.py b/Lib/enum.py
index 994a7b9c73f9a7..f5448a1788e4d2 100644
--- a/Lib/enum.py
+++ b/Lib/enum.py
@@ -1,8 +1,6 @@
 import sys
 import builtins as bltns
 from types import MappingProxyType, DynamicClassAttribute
-from operator import or_ as _or_
-from functools import reduce
 
 
 __all__ = [
@@ -1884,7 +1882,8 @@ def __call__(self, enumeration):
                     missed = [v for v in values if v not in member_values]
                     if missed:
                         missing_names.append(name)
-                        missing_value |= reduce(_or_, missed)
+                        for val in missed:
+                            missing_value |= val
                 if missing_names:
                     if len(missing_names) == 1:
                         alias = 'alias %s is missing' % missing_names[0]
diff --git a/Misc/NEWS.d/next/Library/2023-09-23-12-47-45.gh-issue-109653.9wZBfs.rst b/Misc/NEWS.d/next/Library/2023-09-23-12-47-45.gh-issue-109653.9wZBfs.rst
new file mode 100644
index 00000000000000..1d0f0e4f83b5e1
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-09-23-12-47-45.gh-issue-109653.9wZBfs.rst
@@ -0,0 +1 @@
+Reduce the import time of :mod:`enum` by over 50%. Patch by Alex Waygood.