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PEP 416: Add a builtin frozendict type #58370

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PEP 416: Add a builtin frozendict type#58370
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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-featureA feature request or enhancement

Description

@vstinner
vstinner
opened on Feb 29, 2012
BPO 14162
Nosy @vstinner
Files
  • frozendict.patch
  • frozendict_builtins.patch
  • type_final.patch
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = <Date 2012-03-26.20:22:50.839>
created_at = <Date 2012-02-29.18:05:03.872>
labels = ['interpreter-core', 'type-feature']
title = 'PEP 416: Add a builtin frozendict type'
updated_at = <Date 2012-03-26.20:22:50.837>
user = 'https://github.com/vstinner'

    bugs.python.org fields:

    activity = <Date 2012-03-26.20:22:50.837>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2012-03-26.20:22:50.839>
closer = 'vstinner'
components = ['Interpreter Core']
creation = <Date 2012-02-29.18:05:03.872>
creator = 'vstinner'
dependencies = []
files = ['24685', '24690', '24696']
hgrepos = []
issue_num = 14162
keywords = ['patch']
message_count = 5.0
messages = ['154655', '154656', '154670', '154690', '156866']
nosy_count = 1.0
nosy_names = ['vstinner']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue14162'
versions = ['Python 3.3']

    Linked PRs

    Activity

    1. vstinner commented on Feb 29, 2012

      @vstinner
      vstinner
      on Feb 29, 2012
      MemberAuthor

      Patch to implement the PEP-416.

    2. vstinner
      added
      interpreter-core(Objects, Python, Grammar, and Parser dirs)
      type-featureA feature request or enhancement
      on Feb 29, 2012

    3. vstinner commented on Feb 29, 2012

      @vstinner
      vstinner
      on Feb 29, 2012
      MemberAuthor

      There is no documentation update yet.

    4. vstinner commented on Mar 1, 2012

      @vstinner
      vstinner
      on Mar 1, 2012
      MemberAuthor

      frozendict_builtins.patch: make CPython supports frozendict for the __builtins__ mapping. It is an example of frozendict usage which helps my pysandbox project.

    5. vstinner
      changed the title [-]Implementation of the PEP 416 (Add a builtin frozendict type)[/-] [+]PEP 416: Add a builtin frozendict type[/+] on Mar 1, 2012

    6. vstinner commented on Mar 1, 2012

      @vstinner
      vstinner
      on Mar 1, 2012
      MemberAuthor

      Another frozendict usage example: freeze the dict of a new type if it contains __final__ in its namespace.

      Example:

      >>> class Classic:
...     pass
... 
>>> Classic.attr=1
>>> class FinalizedType:
...     __final__=True
... 
>>> FinalizedType.attr=1
(...)
TypeError: 'frozendict' object does not support item assignment

      This patch is not part of the PEP-416 and is just a proof-of-concept.

    7. vstinner commented on Mar 26, 2012

      @vstinner
      vstinner
      on Mar 26, 2012
      MemberAuthor

      The PEP has been rejected. See issue bpo-14386 for a new mappingview type.

    8. vstinner
      closed this as completedon Mar 26, 2012
    9. ezio-melotti
      transferred this issue fromon Apr 10, 2022
    10. da-woods
      added a commit that references this issue on Jun 2, 2026

      pythongh-58370 Document and test frozendict class matching behaviour

      091478e
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