[3.13] gh-114713: Handle case of an empty string passed to zoneinfo.ZoneInfo (GH-114731) (#132563)

gh-114713: Handle case of an empty string passed to `zoneinfo.ZoneInfo` (GH-114731)
(cherry picked from commit 884df11)

Co-authored-by: Bogdan Romanyuk <[email protected]>
Co-authored-by: Stan Ulbrych <[email protected]>
Co-authored-by: Kirill Podoprigora <[email protected]>

Author: 4 people

Lib/test/test_zoneinfo/test_zoneinfo.py

@@ -235,6 +235,7 @@ def test_bad_keys_paths(self):
             "../zoneinfo/America/Los_Angeles",  # Traverses above TZPATH
             "America/../America/Los_Angeles",  # Not normalized
             "America/./Los_Angeles",
+            "",
         ]
 
         for bad_key in bad_keys:

Lib/zoneinfo/_tzpath.py

@@ -83,6 +83,11 @@ def find_tzfile(key):
 
 
 def _validate_tzfile_path(path, _base=_TEST_PATH):
+    if not path:
+        raise ValueError(
+            "ZoneInfo key must not be an empty string"
+        )
+
     if os.path.isabs(path):
         raise ValueError(
             f"ZoneInfo keys may not be absolute paths, got: {path}"

Misc/NEWS.d/next/Library/2025-03-09-01-09-12.gh-issue-114713.lkq9vZ.rst

@@ -0,0 +1 @@
+Handle case of an empty string passed to :class:`zoneinfo.ZoneInfo`.