From 5e390a0fc825f21952beb158e2bda3c5e007fac9 Mon Sep 17 00:00:00 2001
From: Daniel Hollas <danekhollas@gmail.com>
Date: Wed, 31 Jan 2024 09:29:44 +0000
Subject: [PATCH] gh-109653: Speedup import of threading module (#114509)

Avoiding an import of functools leads to 50% speedup of import time.

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
---
 Lib/threading.py                                              | 4 +---
 .../Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst    | 1 +
 2 files changed, 2 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst

diff --git a/Lib/threading.py b/Lib/threading.py
index 00b95f8d92a..75a08e5aac9 100644
--- a/Lib/threading.py
+++ b/Lib/threading.py
@@ -3,7 +3,6 @@
 import os as _os
 import sys as _sys
 import _thread
-import functools
 import warnings
 
 from time import monotonic as _time
@@ -1630,8 +1629,7 @@ def _register_atexit(func, *arg, **kwargs):
     if _SHUTTING_DOWN:
         raise RuntimeError("can't register atexit after shutdown")
 
-    call = functools.partial(func, *arg, **kwargs)
-    _threading_atexits.append(call)
+    _threading_atexits.append(lambda: func(*arg, **kwargs))
 
 
 from _thread import stack_size
diff --git a/Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst b/Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst
new file mode 100644
index 00000000000..76074df9c76
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-01-23-23-13-47.gh-issue-109653.KLBHmT.rst
@@ -0,0 +1 @@
+Reduce the import time of :mod:`threading` module by ~50%. Patch by Daniel Hollas.