https://github.com/python/cpython/commit/dd64e4260e0d114f8259f15bc86fb17c5b08c80b commit: dd64e4260e0d114f8259f15bc86fb17c5b08c80b branch: main author: Pieter Eendebak <[email protected]> committer: vstinner <[email protected]> date: 2026-02-18T12:30:26+01:00 summary:
gh-141510: Implement copy and deepcopy for frozendict (#144905) Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com> Co-authored-by: Victor Stinner <[email protected]> files: A Misc/NEWS.d/next/Library/2026-02-17-11-28-37.gh-issue-141510.OpAz0M.rst M Lib/copy.py M Lib/test/test_copy.py diff --git a/Lib/copy.py b/Lib/copy.py index 4c024ab5311d2d..33dabb3395a7c0 100644 --- a/Lib/copy.py +++ b/Lib/copy.py @@ -101,7 +101,7 @@ def copy(x): _copy_atomic_types = frozenset({types.NoneType, int, float, bool, complex, str, tuple, - bytes, frozenset, type, range, slice, property, + bytes, frozendict, frozenset, type, range, slice, property, types.BuiltinFunctionType, types.EllipsisType, types.NotImplementedType, types.FunctionType, types.CodeType, weakref.ref, super}) @@ -203,6 +203,11 @@ def _deepcopy_dict(x, memo, deepcopy=deepcopy): return y d[dict] = _deepcopy_dict +def _deepcopy_frozendict(x, memo, deepcopy=deepcopy): + y = _deepcopy_dict(x, memo, deepcopy) + return frozendict(y) +d[frozendict] = _deepcopy_frozendict + def _deepcopy_method(x, memo): # Copy instance methods return type(x)(x.__func__, deepcopy(x.__self__, memo)) d[types.MethodType] = _deepcopy_method diff --git a/Lib/test/test_copy.py b/Lib/test/test_copy.py index cfef24727e8c82..858e5e089d5aba 100644 --- a/Lib/test/test_copy.py +++ b/Lib/test/test_copy.py @@ -133,6 +133,12 @@ def test_copy_dict(self): self.assertEqual(y, x) self.assertIsNot(y, x) + def test_copy_frozendict(self): + x = frozendict(x=1, y=2) + self.assertIs(copy.copy(x), x) + x = frozendict() + self.assertIs(copy.copy(x), x) + def test_copy_set(self): x = {1, 2, 3} y = copy.copy(x) @@ -419,6 +425,13 @@ def test_deepcopy_dict(self): self.assertIsNot(x, y) self.assertIsNot(x["foo"], y["foo"]) + def test_deepcopy_frozendict(self): + x = frozendict({"foo": [1, 2], "bar": 3}) + y = copy.deepcopy(x) + self.assertEqual(y, x) + self.assertIsNot(x, y) + self.assertIsNot(x["foo"], y["foo"]) + @support.skip_emscripten_stack_overflow() @support.skip_wasi_stack_overflow() def test_deepcopy_reflexive_dict(self): diff --git a/Misc/NEWS.d/next/Library/2026-02-17-11-28-37.gh-issue-141510.OpAz0M.rst b/Misc/NEWS.d/next/Library/2026-02-17-11-28-37.gh-issue-141510.OpAz0M.rst new file mode 100644 index 00000000000000..5b604124c6d7cc --- /dev/null +++ b/Misc/NEWS.d/next/Library/2026-02-17-11-28-37.gh-issue-141510.OpAz0M.rst @@ -0,0 +1,2 @@ +The :mod:`copy` module now supports the :class:`frozendict` type. Patch by +Pieter Eendebak based on work by Victor Stinner. _______________________________________________ Python-checkins mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3//lists/python-checkins.python.org Member address: [email protected]
