From 1121c80fdad1fc1a175f4691f33272cf28a66e83 Mon Sep 17 00:00:00 2001
From: Grigory Bukovsky <32143244+booqoffsky@users.noreply.github.com>
Date: Fri, 14 Mar 2025 01:57:38 +0300
Subject: gh-131196: Improve perfomance of `UUID.hex` and `UUID.__str__` by
 ~10% (#131197)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Results before and after the fix:

```
hex
before: 0.021755493999989994
after:  0.01465080400066654

str
before: 0.06381790500017814
after:  0.05134949700004654
```

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
---
 Lib/uuid.py                                                        | 7 +++----
 .../next/Library/2025-03-13-19-53-57.gh-issue-131196.3sBFv2.rst    | 1 +
 2 files changed, 4 insertions(+), 4 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2025-03-13-19-53-57.gh-issue-131196.3sBFv2.rst

diff --git a/Lib/uuid.py b/Lib/uuid.py
index 7a12b48..6f7a7a3 100644
--- a/Lib/uuid.py
+++ b/Lib/uuid.py
@@ -321,9 +321,8 @@ class UUID:
         raise TypeError('UUID objects are immutable')
 
     def __str__(self):
-        hex = '%032x' % self.int
-        return '%s-%s-%s-%s-%s' % (
-            hex[:8], hex[8:12], hex[12:16], hex[16:20], hex[20:])
+        x = self.hex
+        return f'{x[:8]}-{x[8:12]}-{x[12:16]}-{x[16:20]}-{x[20:]}'
 
     @property
     def bytes(self):
@@ -387,7 +386,7 @@ class UUID:
 
     @property
     def hex(self):
-        return '%032x' % self.int
+        return self.bytes.hex()
 
     @property
     def urn(self):
diff --git a/Misc/NEWS.d/next/Library/2025-03-13-19-53-57.gh-issue-131196.3sBFv2.rst b/Misc/NEWS.d/next/Library/2025-03-13-19-53-57.gh-issue-131196.3sBFv2.rst
new file mode 100644
index 0000000..72c10fe
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-03-13-19-53-57.gh-issue-131196.3sBFv2.rst
@@ -0,0 +1 @@
+Improve perfomance of :attr:`uuid.UUID.hex` and :meth:`uuid.UUID.__str__ <object.__str__>`.
-- 
cgit v0.12