Description

vstinner

opened on Nov 13, 2025

Issue body actions

Feature or enhancement

Proposal:

Issue created to track the implementation of https://peps.python.org/pep-0814/.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• [WIP] gh-141510: PEP 814: Add built-in frozendict type #141508
• gh-141510, PEP 814: Add built-in frozendict type #144757
• gh-141510, PEP 814: Add frozendict support to json #144903
• gh-141510: Replace MappingProxyType with frozendict #144904
• gh-141510: Implement copy and deepcopy for frozendict #144905
• gh-141510: Use frozendict for errno.errorcode #144906
• gh-141510: Run regen-test-frozenmain for frozendict #144907
• gh-141510: Support frozendict in pprint #144908
• gh-141510: Use frozendict in the stdlib #144909
• gh-141510: Use frozendict in the _opcode_metadata #144910
• gh-141510: Update specializer to support frozendict with BINARY_SUBSCR #144911
• gh-141510: Add frozendict fast-path to the set type #144912
• gh-141510: Update mp_length of frozendict to use non atomic operation #144913
• gh-141510: Optimize {frozen}dict.fromkeys for frozendict #144915
• gh-141510: Optimize hash(frozendict) #144919
• gh-141510: Remove unncessary lock holding for frozendict repr #144920
• gh-141510: Change repr(frozendict) for empty dict #144921
• gh-141510: Fix test_xpickle failing with introduction of frozendict #144927
• gh-141510: Mention frozendict in dict documentation #144934
• gh-141510, PEP 814: Add frozendict support to pickle #144936
• gh-141510: Add frozendict_check_mutable() #144944
• gh-141510: Fix frozendict.fromkeys() for subclasses #144947
• gh-141510: Update specializer to support frozendict #144949
• gh-141510: Fix frozendict.fromkeys() for subclasses #144952
• gh-141510: Add can_modify_dict() in dictobject.c #144955
• gh-141510: Update Whats News for frozendict #144961
• gh-141510: Fix frozendict.fromkeys() for dict subclasses #144962
• gh-141510, PEP 814: Add frozendict support to pickle #144967
• gh-141510: Update ftscalingbench to support frozendict #144999
• gh-141510: Document ParameterizedMIMEHeader.params change #145003
• gh-141510: Fix copy.deepcopy() for recursive frozendict #145027
• gh-145122: Add _GUARD_NOS_ANY_DICT to prevent STORE_SUBSCR_DICT on frozendict #145039
• gh-141510: Fix test_xpickle for Python 3.14 and older #145069
• gh-141510: Test frozendict C API #145081
• gh-141510: Check argument in PyDict_MergeFromSeq2() #145082
• gh-141510: Check argument in PyDict_Contains() #145083
• gh-141510: Test frozendict in test_capi.test_dict #145084
• gh-141510: Change dict_unhashable_type() error message for frozendict #145085
• gh-141510: support frozendict's in the C decimal module #145165
• gh-141510: Update PyDict_Copy documentation with note on frozendict #145249
• gh-141510: Return frozendict unmodified in PyDict_Copy() #145505
• gh-141510: Optimize PyDict_Copy() for frozendict #145509
• gh-141510: Add frozendict support to python-gdb.py #145511
• gh-141510: Always return a dict in PyDict_Copy() #145517
• gh-141510: Don't accept frozendict in PyDict_Watch() #145529
• gh-141510: Add PyAnyDict_AsNewDict() function #145531
• gh-141510: Update PyDict C API doc for frozendict #145533
• gh-141510: Fix frozendict.items() ^ frozendict.items() #145535
• gh-141510: Complete What's New in Python 3.15 for frozendict #145537
• gh-141510: No longer accept frozendict in PyDict_Copy() #145542
• gh-141510: Change marshal version to 6 #145551
• gh-141510: Raise TypeError in PyDict_SetItem() on frozendict #145564
• gh-141510: Support frozendict in plistlib #145590
• gh-141510: Optimize frozendict(frozendict) #145592
• gh-141510: Avoid critical section on frozendict copy #145920
• gh-141510: Document isinstance change for frozendict in What's New #146107
• gh-141510 Update mapping methods in abstract.c to accept frozendict #150692
• gh-141510 Document and test frozendict class matching behaviour #150799
• [3.15] gh-141510 Document and test frozendict class matching behaviour (GH-150799) #151701
• [3.15] gh-141510 Add frozendict fast paths to abstract.c (GH-150692) #151704
• gh-141510: Update marshal module comment with frozendict support #153655
• [3.15] gh-141510: Update marshal module comment with frozendict support (GH-153655) #153681
• gh-141510: Document frozendict support in json #155929
• [3.15] gh-141510: Document frozendict support in json (gh-155929) #155933

Reacted by kalvdans, Chengfeng Xie, Triang-jyed-driung and Piotr Karmelita

Activity

1. vstinner

   added

   type-featureA feature request or enhancementA feature request or enhancement

   on Nov 13, 2025
2. StanFromIreland

   added

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Nov 13, 2025
3. vstinner

   added 5 commits that reference this issue on Feb 12, 2026

   pythongh-141510: PEP 814: Add built-in frozendict type

   544d567

   pythongh-141510, PEP 814: Add built-in frozendict type

   0a23342

   pythongh-141510, PEP 814: Add built-in frozendict type

   995b94d

   pythongh-141510, PEP 814: Add built-in frozendict type

   af4448c

   pythongh-141510, PEP 814: Add built-in frozendict type

   bde4379
4. corona10

   assigned

   corona10

   and

   vstinner

   on Feb 13, 2026
5. vstinner

   added 6 commits that reference this issue on Feb 17, 2026

   gh-141510, PEP 814: Add built-in frozendict type (#144757)

   696cdfc

   pythongh-141510, PEP 814: Add frozendict support to json

   d0e7ed7

   pythongh-141510, PEP 814: Use frozendict in the stdlib

   9692c2b

   pythongh-141510: Replace MappingProxyType with frozendict

   e15b299

   pythongh-141510: Replace MappingProxyType with frozendict

   df40ed7

   pythongh-141510: Use frozendict for errno.errorcode

   a4834a8
6. 204 remaining items

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7. ljfp

   added 4 commits that reference this issue on Apr 25, 2026

   pythongh-141510: Update PyDict C API doc for frozendict (python#145533)

   00ed59c

   pythongh-141510: Avoid critical section on frozendict copy (python#14…

   7fa0baa

   pythongh-141510: Document isinstance change for frozendict in What's …

   306edee

   pythongh-141510: Support `frozendict` in `plistlib` (python#145590)

   896a98c
8. da-woods commented on Jun 16, 2026

   

   da-woods

   on Jun 16, 2026

   Contributor

   More actions

   I attached a couple of PRs to this (which maybe I should have created new issues for in hindsight...). The more important of them is probably #150799 (which documents and tests their _Py_TPFLAGS_MATCH_SELF behaviour
9. vstinner

   added 4 commits that reference this issue on Jun 18, 2026

   gh-141510 Document and test frozendict class matching behaviour (#150799

   fd53ae1

   gh-141510 Add frozendict fast paths to abstract.c (#150692)

   a5568d0

   [3.15] gh-141510 Document and test frozendict class matching behaviour (

   7e36838

   [3.15] gh-141510 Add frozendict fast paths to abstract.c (GH-150692) (#…

   2c09c0e
10. pyctrl

    added 2 commits that reference this issue on Jul 5, 2026

    pythongh-141510 Document and test frozendict class matching behaviour (…

    4bc0cdd

    pythongh-141510 Add frozendict fast paths to abstract.c (python#150692)

    1ff92c0
11. sobolevn

    added 2 commits that reference this issue on Jul 14, 2026

    gh-141510: Update `marshal` module comment with `frozendict` support (#…

    37571ea

    [3.15] gh-141510: Update `marshal` module comment with `frozendict` s…

    3597587
12. corona10

    added a commit that references this issue on Aug 17, 2026

    gh-141510: Document frozendict support in json (gh-155929)

    c3df37c
13. hugovk

    added a commit that references this issue on Aug 19, 2026

    [3.15] gh-141510: Document frozendict support in json (gh-155929) (#1…

    0bfe0f1

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