Add Support for 3.14 (and 3.13) by paultiq · Pull Request #565 · lidatong/dataclasses-json

paultiq · 2025-08-20T01:51:00Z

Thank you for this project!

I took a moment to update the project to support 3.14:

Fixed a PEP649 breaking issue with 3.14... this could use a good review.
Updated the project to test all current (and upcoming) versions: 3.9 through 3.14, plus 3.14t and pypy3.11.

Housekeeping - optional:

Dropped 3.7 and 3.8, since they're long EOL.
Left support for 3.9, although it's EOL in a few weeks.
Moved project to uv & uv-build
Updated lock file to latests
Updated gh actions
Added pre-commits, although more could be added - ruff formatter has a lot of opinions.
Added PYPI version classifiers
Provided a placeholder for switching to pypi trusted publishers, if you want.
Added badgers to readme for: pypi version, python versions, and a coverage report (also hooked into the action)

The first part w/ 3.14 support is really the purpose here, and I'm happy to roll back the housekeeping stuff if you want just the first part but not second part.

Thank you!

skupr-anaconda · 2025-12-23T08:48:59Z

pyproject.toml

+]
+dependencies = [
+    "typing-inspect>=0.4.0, <1",
+    "marshmallow>=3.18.0,<4.0.0",


Will it support marshmallow 4.0.0+? Because marshmallow 4.1.0 tested against Python 3.14 https://github.com/marshmallow-code/marshmallow/blob/4.1.0/CHANGELOG.rst#410-2025-11-01.

I think conda won't have py314 support for marshmallow <4.0.1:

conda search marshmallow Loading channels: done # Name Version Build Channel marshmallow 2.16.3 py_0 pkgs/main marshmallow 3.2.0 py_0 pkgs/main marshmallow 3.2.2 py_0 pkgs/main marshmallow 3.5.1 py_0 pkgs/main marshmallow 3.5.2 py_0 pkgs/main marshmallow 3.6.1 py_0 pkgs/main marshmallow 3.7.0 py_0 pkgs/main marshmallow 3.7.1 py_0 pkgs/main marshmallow 3.8.0 py_0 pkgs/main marshmallow 3.9.1 pyhd3eb1b0_0 pkgs/main marshmallow 3.10.0 pyhd3eb1b0_0 pkgs/main marshmallow 3.11.1 pyhd3eb1b0_0 pkgs/main marshmallow 3.12.0 pyhd3eb1b0_0 pkgs/main marshmallow 3.12.1 pyhd3eb1b0_0 pkgs/main marshmallow 3.12.2 pyhd3eb1b0_0 pkgs/main marshmallow 3.19.0 py310hca03da5_0 pkgs/main marshmallow 3.19.0 py311hca03da5_0 pkgs/main marshmallow 3.19.0 py312hca03da5_0 pkgs/main marshmallow 3.19.0 py313hca03da5_0 pkgs/main marshmallow 3.19.0 py38hca03da5_0 pkgs/main marshmallow 3.19.0 py39hca03da5_0 pkgs/main marshmallow 4.0.0 py310hca03da5_0 pkgs/main marshmallow 4.0.0 py311hca03da5_0 pkgs/main marshmallow 4.0.0 py312hca03da5_0 pkgs/main marshmallow 4.0.0 py313hca03da5_0 pkgs/main marshmallow 4.0.0 py39hca03da5_0 pkgs/main marshmallow 4.0.1 py310hca03da5_0 pkgs/main marshmallow 4.0.1 py310hca03da5_1 pkgs/main marshmallow 4.0.1 py311hca03da5_0 pkgs/main marshmallow 4.0.1 py311hca03da5_1 pkgs/main marshmallow 4.0.1 py312hca03da5_0 pkgs/main marshmallow 4.0.1 py312hca03da5_1 pkgs/main marshmallow 4.0.1 py313hca03da5_0 pkgs/main marshmallow 4.0.1 py313hca03da5_1 pkgs/main marshmallow 4.0.1 py314hca03da5_1 pkgs/main marshmallow 4.0.1 py39hca03da5_0 pkgs/main

This can affect the downstream packages langsmith -> langchain-core

If I try to build dataclasses-json 0.6.7 with marshmallow 4.0.1 for py314 on osx-arm64, then I get this error in the test environment:

## Package Plan ## environment location: /Users/sss/opt/miniconda3/conda-bld/dataclasses-json_1766484508581/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_plac The following NEW packages will be INSTALLED: attrs: 25.4.0-py314hca03da5_2 bzip2: 1.0.8-h80987f9_6 ca-certificates: 2025.12.2-hca03da5_0 dataclasses-json: 0.6.7-py314hca03da5_1 local hypothesis: 6.142.3-py314hca03da5_2 iniconfig: 2.1.0-py314hca03da5_0 libcxx: 20.1.8-hd7fd590_1 libexpat: 2.7.3-h50f4ffc_4 libffi: 3.4.4-hca03da5_1 libmpdec: 4.0.0-h80987f9_0 libzlib: 1.3.1-h5f15de7_0 lz4-c: 1.9.4-h313beb8_1 marshmallow: 4.0.1-py314hca03da5_1 mypy_extensions: 1.0.0-py314hca03da5_0 ncurses: 6.5-hee39554_0 openssl: 3.0.18-h9b4081a_0 packaging: 25.0-py314hca03da5_1 pip: 25.3-pyh0d26453_0 pluggy: 1.5.0-py314hca03da5_0 pytest: 7.4.4-py314hca03da5_0 python: 3.14.2-h1858270_101_cp314 python_abi: 3.14-2_cp314 readline: 8.3-h0b18652_0 simplejson: 3.20.2-py314haa24f5a_0 sortedcontainers: 2.4.0-pyhd3eb1b0_0 sqlite: 3.51.0-hab6afd1_0 tk: 8.6.15-hcd8a7d5_0 typing_extensions: 4.15.0-py314hca03da5_0 typing_inspect: 0.9.0-py314hca03da5_0 tzdata: 2025b-h04d1e81_0 xz: 5.6.4-h80987f9_1 zlib: 1.3.1-h5f15de7_0 zstd: 1.5.7-h817c040_0 Preparing transaction: ...working... done Verifying transaction: ...working... done Executing transaction: ...working... done export PREFIX=/Users/sss/opt/miniconda3/conda-bld/dataclasses-json_1766484508581/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_plac export SRC_DIR=/Users/sss/opt/miniconda3/conda-bld/dataclasses-json_1766484508581/test_tmp import: 'dataclasses_json' import: 'dataclasses_json' + python -c 'from importlib.metadata import version; assert(version('\''dataclasses-json'\'')=='\''0.6.7'\'')' + pytest -v --ignore=gh_src/tests/test_annotations.py gh_src/tests ============================= test session starts ============================== platform darwin -- Python 3.14.2, pytest-7.4.4, pluggy-1.5.0 -- $PREFIX/bin/python cachedir: .pytest_cache hypothesis profile 'default' rootdir: $SRC_DIR plugins: hypothesis-6.142.3 collecting ... collected 324 items / 1 error ==================================== ERRORS ==================================== ________________ ERROR collecting gh_src/tests/test_metadata.py ________________ gh_src/tests/test_metadata.py:39: in <module> car_schema = Car.schema() ../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_plac/lib/python3.14/site-packages/dataclasses_json/api.py:95: in schema return Schema(only=only, E TypeError: Schema.__init__() got an unexpected keyword argument 'context' =============================== warnings summary =============================== gh_src/tests/test_collection_of_unions.py:8 $SRC_DIR/gh_src/tests/test_collection_of_unions.py:8: PytestCollectionWarning: cannot collect test class 'TestChild' because it has a __init__ constructor (from: gh_src/tests/test_collection_of_unions.py) @dataclass_json gh_src/tests/test_collection_of_unions.py:14 $SRC_DIR/gh_src/tests/test_collection_of_unions.py:14: PytestCollectionWarning: cannot collect test class 'TestOtherChild' because it has a __init__ constructor (from: gh_src/tests/test_collection_of_unions.py) @dataclass_json -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html =========================== short test summary info ============================ ERROR gh_src/tests/test_metadata.py - TypeError: Schema.__init__() got an une... !!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!! ========================= 2 warnings, 1 error in 0.84s ========================= WARNING: Tests failed for dataclasses-json-0.6.7-py314hca03da5_1.conda - moving package to /Users/sss/opt/miniconda3/conda-bld/broken CondaBuildUserError: TESTS FAILED: dataclasses-json-0.6.7-py314hca03da5_1.conda

skupr-anaconda · 2025-12-23T10:20:58Z

pyproject.toml

-maintainers = ['Charles Li <charles.dt.li@gmail.com>', 'Georgiy Zubrienko <gzu@ecco.com>', 'Vitaliy Savitskiy <visa@ecco.com>', 'Matthias Als <mata@ecco.com>']
-license = 'MIT'
+authors = [{ name = "Charles Li", email = "charles.dt.li@gmail.com" }]
+requires-python = ">=3.9"


You can drop 3.9 https://devguide.python.org/versions/#status-of-python-versions

paultiq · 2025-12-23T14:32:03Z

See #568, it seems like there's noone left to approve PRs.

That's too bad.

* Nonetheless, I updated the project to drop 3.9. The marshmallow change should be another PR, if there's anyone left to approve anything here.

edwargix · 2026-01-31T19:09:18Z

For packagers looking for a minimal set of changes to make for Python 3.14 support, this may be helpful: https://aur.archlinux.org/cgit/aur.git/commit/?h=python-dataclasses-json&id=478b55df2662505360bf0f09c9e2f09a7f651478

paultiq added 7 commits August 19, 2025 19:34

UV-ize and update test matrix

88bc358

update mypy check

d0a1a38

fix 3.14 / PEP649, but maintain bw compat

2079988

Revert but leave the trusted publish action commented out

98a2f3d

update README.md

5a5c919

Bump Python rev

8c4723f

add coverage badget

73a5dc6

skupr-anaconda reviewed Dec 23, 2025

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skupr-anaconda mentioned this pull request Dec 23, 2025

rebuild-py314 AnacondaRecipes/dataclasses-json-feedstock#7

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build: drop support for 3.9

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Add Support for 3.14 (and 3.13)#565

Add Support for 3.14 (and 3.13)#565
paultiq wants to merge 8 commits intolidatong:masterfrom
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