https://github.com/python/cpython/commit/e1c09fff054ebcb90e72bba25ef7332bcabec92b
commit: e1c09fff054ebcb90e72bba25ef7332bcabec92b
branch: main
author: Jelle Zijlstra <jelle.zijls...@gmail.com>
committer: JelleZijlstra <jelle.zijls...@gmail.com>
date: 2025-04-24T16:49:09Z
summary:
gh-132882: Fix copying of unions with members that do not support __or__
(#132883)
files:
A Misc/NEWS.d/next/Library/2025-04-24-09-10-04.gh-issue-132882.6zoyp5.rst
M Lib/copyreg.py
M Lib/test/test_typing.py
diff --git a/Lib/copyreg.py b/Lib/copyreg.py
index 17c5dde67c887c..a5e8add4a554d7 100644
--- a/Lib/copyreg.py
+++ b/Lib/copyreg.py
@@ -31,8 +31,8 @@ def pickle_complex(c):
pickle(complex, pickle_complex, complex)
def pickle_union(obj):
- import functools, operator
- return functools.reduce, (operator.or_, obj.__args__)
+ import typing, operator
+ return operator.getitem, (typing.Union, obj.__args__)
pickle(type(int | str), pickle_union)
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 4fd3d53b72c01b..93cc2a8ca83b8f 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -5283,10 +5283,12 @@ class Node(Generic[T]): ...
Tuple[Any, Any], Node[T], Node[int], Node[Any],
typing.Iterable[T],
typing.Iterable[Any], typing.Iterable[int], typing.Dict[int,
str],
typing.Dict[T, Any], ClassVar[int], ClassVar[List[T]],
Tuple['T', 'T'],
- Union['T', int], List['T'], typing.Mapping['T', int]]
- for t in things + [Any]:
- self.assertEqual(t, copy(t))
- self.assertEqual(t, deepcopy(t))
+ Union['T', int], List['T'], typing.Mapping['T', int],
+ Union[b"x", b"y"], Any]
+ for t in things:
+ with self.subTest(thing=t):
+ self.assertEqual(t, copy(t))
+ self.assertEqual(t, deepcopy(t))
def test_immutability_by_copy_and_pickle(self):
# Special forms like Union, Any, etc., generic aliases to containers
like List,
diff --git
a/Misc/NEWS.d/next/Library/2025-04-24-09-10-04.gh-issue-132882.6zoyp5.rst
b/Misc/NEWS.d/next/Library/2025-04-24-09-10-04.gh-issue-132882.6zoyp5.rst
new file mode 100644
index 00000000000000..a93469fdcf9ace
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-04-24-09-10-04.gh-issue-132882.6zoyp5.rst
@@ -0,0 +1,2 @@
+Fix copying of :class:`typing.Union` objects containing objects that do not
+support the ``|`` operator.
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