From 6e6dc2517379289932c68fc986ee3994468374fc Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Fri, 30 Jul 2021 09:20:59 -0700
Subject: bpo-44753: Don't use logfile extension when determining old files to
 be deleted (GH-27475) (GH-27487)

(cherry picked from commit 6ff890380971752299325bd28eab80ec936975cf)
---
 Lib/logging/handlers.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Lib/logging/handlers.py b/Lib/logging/handlers.py
index 2a45f53..4cabc0d 100644
--- a/Lib/logging/handlers.py
+++ b/Lib/logging/handlers.py
@@ -359,7 +359,8 @@ class TimedRotatingFileHandler(BaseRotatingHandler):
         dirName, baseName = os.path.split(self.baseFilename)
         fileNames = os.listdir(dirName)
         result = []
-        prefix = baseName + "."
+        # See bpo-44753: Don't use the extension when computing the prefix.
+        prefix = os.path.splitext(baseName)[0] + "."
         plen = len(prefix)
         for fileName in fileNames:
             if fileName[:plen] == prefix:
-- 
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