From f90ff0367271ea474b4ce3c8e2643cb51d188c18 Mon Sep 17 00:00:00 2001
From: Nice Zombies <nineteendo19d0@gmail.com>
Date: Wed, 10 Apr 2024 10:28:48 +0200
Subject: [PATCH] gh-117686: Improve the performance of ntpath.expanduser()
 (#117690)

Refactor out _get_bothseps() call from the loop.
---
 Lib/ntpath.py            | 4 +++-
 Misc/NEWS.d/3.13.0a6.rst | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index da5231ff2c0931..f5d1a2195dd633 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -368,13 +368,15 @@ def expanduser(path):
     If user or $HOME is unknown, do nothing."""
     path = os.fspath(path)
     if isinstance(path, bytes):
+        seps = b'\\/'
         tilde = b'~'
     else:
+        seps = '\\/'
         tilde = '~'
     if not path.startswith(tilde):
         return path
     i, n = 1, len(path)
-    while i < n and path[i] not in _get_bothseps(path):
+    while i < n and path[i] not in seps:
         i += 1
 
     if 'USERPROFILE' in os.environ:
diff --git a/Misc/NEWS.d/3.13.0a6.rst b/Misc/NEWS.d/3.13.0a6.rst
index 52735dba3578b5..06807b396ed5da 100644
--- a/Misc/NEWS.d/3.13.0a6.rst
+++ b/Misc/NEWS.d/3.13.0a6.rst
@@ -4,7 +4,7 @@
 .. release date: 2024-04-09
 .. section: Core and Builtins
 
-Improve performance of :func:`os.path.join`.
+Improve performance of :func:`os.path.join` and :func:`os.path.expanduser`.
 
 ..