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Lib
- copy.py
- test
  - test_copy.py
Misc/NEWS.d/next/Library
- 2026-02-17-11-28-37.gh-issue-141510.OpAz0M.rst

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`‎Lib/copy.py‎`

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+6-1Lines changed: 6 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -101,7 +101,7 @@ def copy(x):`
`101`	`101`
`102`	`102`
`103`	`103`	`_copy_atomic_types = frozenset({types.NoneType, int, float, bool, complex, str, tuple,`
`104`		`- bytes, frozenset, type, range, slice, property,`
	`104`	`+ bytes, frozendict, frozenset, type, range, slice, property,`
`105`	`105`	`types.BuiltinFunctionType, types.EllipsisType,`
`106`	`106`	`types.NotImplementedType, types.FunctionType, types.CodeType,`
`107`	`107`	`weakref.ref, super})`
`@@ -203,6 +203,11 @@ def _deepcopy_dict(x, memo, deepcopy=deepcopy):`
`203`	`203`	`return y`
`204`	`204`	`d[dict] = _deepcopy_dict`
`205`	`205`
	`206`	`+def _deepcopy_frozendict(x, memo, deepcopy=deepcopy):`
	`207`	`+ y = _deepcopy_dict(x, memo, deepcopy)`
	`208`	`+ return frozendict(y)`
	`209`	`+d[frozendict] = _deepcopy_frozendict`
	`210`	`+`
`206`	`211`	`def _deepcopy_method(x, memo): # Copy instance methods`
`207`	`212`	`return type(x)(x.__func__, deepcopy(x.__self__, memo))`
`208`	`213`	`d[types.MethodType] = _deepcopy_method`

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`‎Lib/test/test_copy.py‎`

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+13Lines changed: 13 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -133,6 +133,12 @@ def test_copy_dict(self):`
`133`	`133`	`self.assertEqual(y, x)`
`134`	`134`	`self.assertIsNot(y, x)`
`135`	`135`
	`136`	`+ def test_copy_frozendict(self):`
	`137`	`+ x = frozendict(x=1, y=2)`
	`138`	`+ self.assertIs(copy.copy(x), x)`
	`139`	`+ x = frozendict()`
	`140`	`+ self.assertIs(copy.copy(x), x)`
	`141`	`+`
`136`	`142`	`def test_copy_set(self):`
`137`	`143`	`x = {1, 2, 3}`
`138`	`144`	`y = copy.copy(x)`
`@@ -419,6 +425,13 @@ def test_deepcopy_dict(self):`
`419`	`425`	`self.assertIsNot(x, y)`
`420`	`426`	`self.assertIsNot(x["foo"], y["foo"])`
`421`	`427`
	`428`	`+ def test_deepcopy_frozendict(self):`
	`429`	`+ x = frozendict({"foo": [1, 2], "bar": 3})`
	`430`	`+ y = copy.deepcopy(x)`
	`431`	`+ self.assertEqual(y, x)`
	`432`	`+ self.assertIsNot(x, y)`
	`433`	`+ self.assertIsNot(x["foo"], y["foo"])`
	`434`	`+`
`422`	`435`	`@support.skip_emscripten_stack_overflow()`
`423`	`436`	`@support.skip_wasi_stack_overflow()`
`424`	`437`	`def test_deepcopy_reflexive_dict(self):`

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`‎Misc/NEWS.d/next/Library/2026-02-17-11-28-37.gh-issue-141510.OpAz0M.rst‎`

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+2Lines changed: 2 additions & 0 deletions

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+The :mod:`copy` module now supports the :class:`frozendict` type. Patch by
	`2`	`+Pieter Eendebak based on work by Victor Stinner.`

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