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JSON does not preserve the order of OrderedDict #100272

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JSON does not preserve the order of OrderedDict#100272
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3.12only security fixestype-bugAn unexpected behavior, bug, or error

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@serhiy-storchaka
serhiy-storchaka
opened on Dec 15, 2022

#95385 caused a regression in JSON serialization of OrderedDict when use the C implementation.

>>> import collections, json
>>> od = collections.OrderedDict(a=1, b=2)
>>> od.move_to_end('a')
>>> od
OrderedDict([('b', 2), ('a', 1)])
>>> json.dumps(od)
'{"a": 1, "b": 2}'

With the pure Python implementation, as well as in older Pythons, you get '{"b": 2, "a": 1}'.

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Activity

  1. serhiy-storchaka
    added
    type-bugAn unexpected behavior, bug, or error
    3.12only security fixes
    on Dec 15, 2022
  2. serhiy-storchaka
    added this to JSON issueson Dec 15, 2022
  3. serhiy-storchaka
    added 2 commits that reference this issue on Dec 15, 2022

    pythongh-100272: Fix JSON serialization of OrderedDict

    3262ea6

    gh-100272: Fix JSON serialization of OrderedDict (GH-100273)

    0fe61d0
  4. serhiy-storchaka
    closed this as completedon Dec 17, 2022
  5. serhiy-storchaka
    moved this to Done in JSON issueson Dec 17, 2022
  6. shihai1991
    added a commit that references this issue on Dec 18, 2022

    Merge remote-tracking branch 'origin/main' into bpo_34697

    2878571
  7. carljm
    added a commit that references this issue on Dec 19, 2022

    Merge branch 'main' into fastmock

    a9af20a
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