https://github.com/python/cpython/commit/8d478c79539ed0ec7071766b7a0afe62fb11f7d4
commit: 8d478c79539ed0ec7071766b7a0afe62fb11f7d4
branch: main
author: Jelle Zijlstra <jelle.zijls...@gmail.com>
committer: JelleZijlstra <jelle.zijls...@gmail.com>
date: 2025-05-12T08:22:55-07:00
summary:

gh-133925: Make typing._UnionGenericAlias hashable (#133929)

files:
A Misc/NEWS.d/next/Library/2025-05-12-06-52-10.gh-issue-133925.elInBY.rst
M Lib/test/test_typing.py
M Lib/typing.py

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index bc03e6bf2d7962..6ef633e4545aef 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -10668,6 +10668,9 @@ def test_eq(self):
         with self.assertWarns(DeprecationWarning):
             self.assertNotEqual(int, typing._UnionGenericAlias)
 
+    def test_hashable(self):
+        self.assertEqual(hash(typing._UnionGenericAlias), hash(Union))
+
 
 def load_tests(loader, tests, pattern):
     import doctest
diff --git a/Lib/typing.py b/Lib/typing.py
index 44f39e9672f46b..3d64480e1431c1 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -1649,6 +1649,9 @@ def __eq__(self, other):
             return True
         return NotImplemented
 
+    def __hash__(self):
+        return hash(Union)
+
 
 class _UnionGenericAlias(metaclass=_UnionGenericAliasMeta):
     """Compatibility hack.
diff --git 
a/Misc/NEWS.d/next/Library/2025-05-12-06-52-10.gh-issue-133925.elInBY.rst 
b/Misc/NEWS.d/next/Library/2025-05-12-06-52-10.gh-issue-133925.elInBY.rst
new file mode 100644
index 00000000000000..328e28abc3b42b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-05-12-06-52-10.gh-issue-133925.elInBY.rst
@@ -0,0 +1 @@
+Make the private class ``typing._UnionGenericAlias`` hashable.

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