From: Sebastian Rittau <srittau@rittau.biz>
Date: Sun, 2 Nov 2025 21:56:59 +0000 (+0100)
Subject: gh-140808: Remove __class_getitem__ from mailbox._ProxyFile (#140838)
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9e5628ad68b768e2a8f0bcd3204b0027e238c45c;p=thirdparty%2FPython%2Fcpython.git

gh-140808: Remove __class_getitem__ from mailbox._ProxyFile (#140838)

Co-authored-by: Emma Smith <emma@emmatyping.dev>
---

diff --git a/Lib/mailbox.py b/Lib/mailbox.py
index b00d9e8634c7..4a44642765cc 100644
--- a/Lib/mailbox.py
+++ b/Lib/mailbox.py
@@ -2090,8 +2090,6 @@ class _ProxyFile:
             return False
         return self._file.closed
 
-    __class_getitem__ = classmethod(GenericAlias)
-
 
 class _PartialFile(_ProxyFile):
     """A read-only wrapper of part of a file."""
diff --git a/Lib/test/test_genericalias.py b/Lib/test/test_genericalias.py
index 4e08adaca05c..9df9296e26ad 100644
--- a/Lib/test/test_genericalias.py
+++ b/Lib/test/test_genericalias.py
@@ -17,7 +17,7 @@ from dataclasses import Field
 from functools import partial, partialmethod, cached_property
 from graphlib import TopologicalSorter
 from logging import LoggerAdapter, StreamHandler
-from mailbox import Mailbox, _PartialFile
+from mailbox import Mailbox
 try:
     import ctypes
 except ImportError:
@@ -117,7 +117,7 @@ class BaseTest(unittest.TestCase):
                      Iterable, Iterator,
                      Reversible,
                      Container, Collection,
-                     Mailbox, _PartialFile,
+                     Mailbox,
                      ContextVar, Token,
                      Field,
                      Set, MutableSet,
diff --git a/Misc/NEWS.d/next/Library/2025-10-31-16-25-13.gh-issue-140808.XBiQ4j.rst b/Misc/NEWS.d/next/Library/2025-10-31-16-25-13.gh-issue-140808.XBiQ4j.rst
new file mode 100644
index 000000000000..090f39c6e25f
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-10-31-16-25-13.gh-issue-140808.XBiQ4j.rst
@@ -0,0 +1 @@
+The internal class ``mailbox._ProxyFile`` is no longer a parameterized generic.