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Add frozendict support to pickle #145091

Closed as duplicate
Closed as duplicate
Add frozendict support to pickle#145091
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pendingThe issue will be closed if no feedback is providedtype-featureA feature request or enhancement

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@rhettinger
rhettinger
opened on Feb 22, 2026
>>> from pickle import dumps
>>> dumps(frozendict(a=1, b=2))
Traceback (most recent call last):
  File "<pyshell#8>", line 1, in <module>
    dumps(frozendict(a=1, b=2))
TypeError: cannot pickle 'frozendict' object

Activity

  1. brianschubert commented on Feb 22, 2026

    @brianschubert
    brianschubert
    on Feb 22, 2026
    Contributor

    Added in #144967, this works on main:

    >>> from pickle import dumps
>>> dumps(frozendict(a=1, b=2))
b'\x80\x05\x95/\x00\x00\x00\x00\x00\x00\x00\x8c\x08builtins\x94\x8c\nfrozendict\x94\x93\x94}\x94(\x8c\x01a\x94K\x01\x8c\x01b\x94K\x02u\x85\x94\x81\x94.'
  2. aisk
    added
    type-featureA feature request or enhancement
    on Feb 22, 2026
  3. aisk
    added this to Pickle and copy issues 🥒on Feb 22, 2026
  4. aisk
    added
    pendingThe issue will be closed if no feedback is provided
    on Feb 22, 2026
  5. rhettinger
    closed this as duplicateon Feb 22, 2026
  6. github-project-automation
    moved this to Done in Pickle and copy issues 🥒on Feb 22, 2026
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