https://github.com/python/cpython/commit/ad9f2ed8caad1cc2f9a62487e4d5fe298ac7acd1
commit: ad9f2ed8caad1cc2f9a62487e4d5fe298ac7acd1
branch: 3.13
author: Miss Islington (bot) <[email protected]>
committer: hugovk <[email protected]>
date: 2025-11-20T18:23:26+02:00
summary:

[3.13] GH-137841: Open tzdata/zones file with UTF-8 encoding (GH-137872) 
(#141608)

Co-authored-by: Adam Turner <[email protected]>

files:
M Lib/zoneinfo/_tzpath.py

diff --git a/Lib/zoneinfo/_tzpath.py b/Lib/zoneinfo/_tzpath.py
index d8ccec82059391..177d32c35eff29 100644
--- a/Lib/zoneinfo/_tzpath.py
+++ b/Lib/zoneinfo/_tzpath.py
@@ -131,7 +131,8 @@ def available_timezones():
     # Start with loading from the tzdata package if it exists: this has a
     # pre-assembled list of zones that only requires opening one file.
     try:
-        with resources.files("tzdata").joinpath("zones").open("r") as f:
+        zones_file = resources.files("tzdata").joinpath("zones")
+        with zones_file.open("r", encoding="utf-8") as f:
             for zone in f:
                 zone = zone.strip()
                 if zone:

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