Published July 30, 2026
| Version v3.3.0
Software
Open
zarr-developers/zarr-python: v3.3.0
Authors/Creators
- Alistair Miles
- Davis Bennett1
- jakirkham
- David Stansby2
- Dimitri Papadopoulos Orfanos3
- Joe Hamman4
- M Bussonnier5
- Josh Moore6
- Max Jones1
- Tom Augspurger
- Deepak Cherian4
- Norman Rzepka7
- Hannes Spitz
- Sanket Verma
- James Bourbeau8
- Andrew Fulton9
- Ryan Abernathey10
- Gregory Lee11
- Ilan Gold12
- Mads R. B. Kristensen11
- Zain Patel13
- Ian Hunt-Isaak4
- Saransh Chopra14
- Matthew Rocklin15
- Nathan Zimmerman
- AWA DESTINY AGHANGU
- Christine P. Chai
- Chuck Daniels1
- 1. @developmentseed
- 2. Cambridge University Hospitals
- 3. CEA
- 4. @earth-mover
- 5. @Quansight-Labs
- 6. @openmicroscopy @German-BioImaging @image-coop
- 7. @scalableminds
- 8. @NVIDIA
- 9. Quansight
- 10. Earthmover PBC
- 11. NVIDIA
- 12. Helmholtz Zentrum
- 13. Maven Securities
- 14. EPFL / Logitech
- 15. @coiled
Description
What's Changed
- Allow s3 testing in face of ambient AWS credentials by @chuckwondo in https://github.com/zarr-developers/zarr-python/pull/3947
- ci: run all of xarray's tests in downstream workflow by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/3940
- chore(deps): bump the actions group across 1 directory with 12 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/3930
- chore: update pre-commit hooks by @pre-commit-ci[bot] in https://github.com/zarr-developers/zarr-python/pull/3943
- chore(zarr-metadata): bump version to 0.1.1 by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3949
- refactor: simplify internal chunk representation by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3899
- Fix V3 time types by @chuckwondo in https://github.com/zarr-developers/zarr-python/pull/3955
- chore: fix ability to run mypy via hatch by @chuckwondo in https://github.com/zarr-developers/zarr-python/pull/3952
- Fix minor typos by @kabilar in https://github.com/zarr-developers/zarr-python/pull/3957
- chore(deps): bump the actions group with 5 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/3951
- deprecate blosc enums by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3963
- BUG: Fix empty Group nodes lacking a "consolidated_metadata" field by @TomAugspurger in https://github.com/zarr-developers/zarr-python/pull/3967
- fix(zarr-metadata): model stored metadata more closely by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3962
- fix: allow writing to 0-dimensional arrays with sharding by @NIK-TIGER-BILL in https://github.com/zarr-developers/zarr-python/pull/3966
- chore(deps): bump the actions group with 2 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/3970
- chore: run mypy from developer environment by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3972
- feat:get_ranges by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3925
- chore: remove warning on fixed length utf32 by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3979
- misc(zarr-metadata): typed constants and fixes by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3978
- chore: cd workflow by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3935
- perf: cache default ArraySpec for regular chunk grids by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3908
- refactor(sharding): store chunks_per_shard explicitly in _ShardIndex by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3975
- docs: update link to developer chat by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3980
- feat(zarr-metadata): partial metadata types by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3982
- chore(zarr-metadata): set up a changelog by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3981
- Optimize partial shard reads by @aldenks in https://github.com/zarr-developers/zarr-python/pull/3004
- Do not install CuPy on darwin by @chuckwondo in https://github.com/zarr-developers/zarr-python/pull/3988
- chore(zarr-metadata): prepare for 0.2.0 release by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3986
- Widen ChunksLike type alias by @chuckwondo in https://github.com/zarr-developers/zarr-python/pull/3990
- fix: match v* when extracting a zarr version from git tags by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3994
- feat: subchunk write order by @ilan-gold in https://github.com/zarr-developers/zarr-python/pull/3826
- prune old string dtype class by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3973
- fix: compare metadata objects by JSON form by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3999
- Run doctests via pytest and fix broken doctests. by @chuckwondo in https://github.com/zarr-developers/zarr-python/pull/4000
- fix(FsspecStore): close owned async filesystem on store.close() by @josh-ag2 in https://github.com/zarr-developers/zarr-python/pull/4003
- chore(deps): bump the actions group across 1 directory with 8 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4014
- fix: use hatch's
defaultenv so the uv installer is inherited by @lhoupert in https://github.com/zarr-developers/zarr-python/pull/4023 - chore: update pre-commit hooks by @pre-commit-ci[bot] in https://github.com/zarr-developers/zarr-python/pull/4024
- docs: test more code snippets in docs by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4018
- chore(deps-dev): bump uv from 0.11.14 to 0.11.15 in the uv group across 1 directory by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4019
- refactor: remove random subchunk ordering by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4011
- fix: make xarray downstream tests work by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4043
- test: add property tests for block and mask indexing by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4054
- refactor: use backported sentinel type by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4046
- chore(deps): bump aiohttp from 3.13.5 to 3.14.0 in the uv group across 1 directory by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4031
- Revert "fix: make xarray downstream tests work" by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4047
- chore: indexing test cleanup by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4001
- refactor/consolidated JSON IO routines by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3998
- chore(deps): bump the actions group with 3 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4058
- Modify custom dtype example to use only public API by @chuckwondo in https://github.com/zarr-developers/zarr-python/pull/4052
- fix: copy attributes passed from the user to avoid mutation by @stibrew in https://github.com/zarr-developers/zarr-python/pull/4060
- docs: add core-developer self-merge policy by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4053
- fix![zarr-metadata]: define JSONValue type, and narrow object annotations to use JSONValue by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4037
- perf: cache lexicographic chunk coords in sharding codec by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4012
- deprecate more enums by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3968
- fix: update OSPO action references to canonical org path by @zkoppert in https://github.com/zarr-developers/zarr-python/pull/3856
- chore(deps): bump tornado from 6.5.5 to 6.5.6 in the uv group across 1 directory by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4062
- harden developer environment by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4066
- chore(deps): bump codecov/codecov-action from 6.0.1 to 7.0.0 in the actions group by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4071
- chore(deps): bump the python-dependencies group with 14 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4072
- chore(deps): bump tornado from 6.5.6 to 6.5.7 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4067
- chore(deps): bump cryptography from 48.0.0 to 48.0.1 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4070
- chore(deps): bump aiohttp from 3.14.0 to 3.14.1 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4069
- Claude/storage codec bugfixes by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4074
- chore(deps): bump bleach from 6.3.0 to 6.4.0 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4081
- Control sharding codec read coalescing with ArrayConfig and runtime config options by @aldenks in https://github.com/zarr-developers/zarr-python/pull/3987
- chore(deps-dev): bump the python-dependencies group across 1 directory with 2 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4080
- allow roundtripping the
BytesCodecby @keewis in https://github.com/zarr-developers/zarr-python/pull/3417 - feat![zarr-metadata]: extensive top-level exports by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4083
- zarr metadata 0.3.0 by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4084
- Claude/py312 modernizations by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4087
- chore(deps): bump CodSpeedHQ/action from 4.17.0 to 4.17.5 in the actions group by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4079
- chore: add rectilinear hypothesis block indexing tests by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4075
- chore(deps): bump pydantic-settings from 2.14.1 to 2.14.2 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4089
- chore: dependabot only updates direct dependencies by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4090
- chore(deps): bump msgpack from 1.1.2 to 1.2.1 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4088
- test: pytest cleanups / modernization by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4093
- fix(testing): correct delete_dir prefix matching in stateful tests by @NIK-TIGER-BILL in https://github.com/zarr-developers/zarr-python/pull/4002
- chore(deps): bump the actions group with 3 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4097
- Remove struct unstable warning by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4100
- chore: test correctness fixes by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4094
- Fix save/load for scalar arrays by @gaoflow in https://github.com/zarr-developers/zarr-python/pull/4103
- docs: add reviewer guidance and author attestation to PR template by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4106
- docs: document zarr.errors changes in the v3 migration guide by @NIK-TIGER-BILL in https://github.com/zarr-developers/zarr-python/pull/4110
- refactor(testing): call super().init in LatencyStore by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4102
- Claude/internal simplifications by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4105
- Fix minor documentation issues by @DimitriPapadopoulos in https://github.com/zarr-developers/zarr-python/pull/4120
- fix: keep element order when writing F-contiguous chunks with vlen codecs by @oldrobotdev in https://github.com/zarr-developers/zarr-python/pull/4116
- test: consolidate vlen F-contiguous regression tests by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4122
- chore(deps): bump the actions group with 5 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4114
- chore(deps): bump joserfc from 1.6.5 to 1.6.8 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4123
- chore: update pre-commit hooks by @pre-commit-ci[bot] in https://github.com/zarr-developers/zarr-python/pull/4125
- Remove broken badge by @DimitriPapadopoulos in https://github.com/zarr-developers/zarr-python/pull/4121
- docs: fix CacheStore max_age_seconds docstring default by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4133
- chore(deps): bump the actions group with 3 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4135
- ci: stop dependabot updates targeting support/v2 by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4136
- docs: fix errors and improve consistency across the documentation by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4132
- test: pass a list, not a generator, to parametrize in test_docs by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4138
- docs: clarify difference between load and open in docstrings by @SAY-5 in https://github.com/zarr-developers/zarr-python/pull/3984
- chore(deps): bump the python-dependencies group across 1 directory with 13 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4137
- test: bind moto server to an ephemeral port to fix xdist deadlock by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4139
- test: enable pytest strict mode, fix duplicate parametrization ids, and add 10m timeout to individual tests by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4140
- perf: use sync methods for chunk encoding / decoding by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/3885
- test: ignore Python 3.15 fork-with-threads DeprecationWarning in test_multiprocessing by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4143
- fix: skip object store prefix markers in list_dir by @AMBRA7592 in https://github.com/zarr-developers/zarr-python/pull/4117
- fix: byte-order handling for structured dtypes in the bytes codec by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4142
- chore: add Ilan Gold to the team list by @ilan-gold in https://github.com/zarr-developers/zarr-python/pull/4145
- docs: 3.3.0 release notes by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4148
- chore: CI worfklows for linting docs by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4076
- chore: cleanup indentation and guidance for release by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4153
- chore(deps): bump the actions group across 1 directory with 6 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4152
- Fix/memorystore buffer aliasing by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4157
- chore: refine link checker configuration by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4158
- fix(store): don't close a shared filesystem in FsspecStore.close() by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4165
- chore(deps): bump setuptools from 82.0.1 to 83.0.0 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4176
- chore(deps): bump pillow from 12.2.0 to 12.3.0 by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4169
- chore(deps): bump the actions group with 3 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4181
- feat: ZipStore accepts open binary file-like objects by @jhamman in https://github.com/zarr-developers/zarr-python/pull/4187
- feat: add type-safe
get_arrayandget_groupmethods toAsyncGroupandGroupby @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4128 - feat(zarr-metadata): Zarr metadata model layer by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4119
- fix: let open_like create arrays by default by @goutamadwant in https://github.com/zarr-developers/zarr-python/pull/4146
- fix: keep FusedCodecPipeline compute off the event-loop thread by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4194
- fix(ArraySpec): proper and robust equality semantics for ArraySpec by checking fill_value for byte-identicality, fixes #3054. by @sehoffmann in https://github.com/zarr-developers/zarr-python/pull/4183
- fix: make benchmark page-cache clearing opt-in, never prompt for sudo by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4200
- perf(indexing): speed up sorted 1-D coordinate selections by @selmanozleyen in https://github.com/zarr-developers/zarr-python/pull/4172
- fix: FusedCodecPipeline falls back to async path for sharded arrays with async-only inner codecs by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4179
- fix: fused pipeline falls back for partial-mixin codecs without sync partial methods by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4201
- fix: FusedCodecPipeline must apply outer AA/BB codecs on partial paths by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4202
- fix(fused codec pipeline): bulk shard decode must only engage for identity full reads by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4203
- docs(zarr-metadata): standalone documentation site; add package justfile by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4208
- docs(zarr-metadata): docs-site polish: repo link, titles, RTD build skips, branding by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4210
- chore(zarr-metadata): build 0.4.0 changelog by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4211
- docs: fix link checker errors and warnings; run weekly by @maxrjones in https://github.com/zarr-developers/zarr-python/pull/4214
- fix: ManagedMemoryStore sync methods must respect the path prefix by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4204
- fix: minor correctness and hygiene fixes from the sync-pipeline audit by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4205
- chore(deps): bump the python-dependencies group across 1 directory with 11 updates by @dependabot[bot] in https://github.com/zarr-developers/zarr-python/pull/4216
- fix: reject malformed chunk keys in DefaultChunkKeyEncoding by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4219
- fix: explicit store sync-IO capability; wrappers forward it; LatencyStore fixes by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4206
- docs: add dev blog, update 3.3.0 release notes by @d-v-b in https://github.com/zarr-developers/zarr-python/pull/4191
New Contributors
- @chuckwondo made their first contribution in https://github.com/zarr-developers/zarr-python/pull/3947
- @kabilar made their first contribution in https://github.com/zarr-developers/zarr-python/pull/3957
- @NIK-TIGER-BILL made their first contribution in https://github.com/zarr-developers/zarr-python/pull/3966
- @josh-ag2 made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4003
- @lhoupert made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4023
- @stibrew made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4060
- @zkoppert made their first contribution in https://github.com/zarr-developers/zarr-python/pull/3856
- @gaoflow made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4103
- @oldrobotdev made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4116
- @SAY-5 made their first contribution in https://github.com/zarr-developers/zarr-python/pull/3984
- @AMBRA7592 made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4117
- @goutamadwant made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4146
- @sehoffmann made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4183
- @selmanozleyen made their first contribution in https://github.com/zarr-developers/zarr-python/pull/4172
Full Changelog: https://github.com/zarr-developers/zarr-python/compare/v3.2.1...v3.3.0
Files
zarr-developers/zarr-python-v3.3.0.zip
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Additional details
Related works
- Is supplement to
- Software: https://github.com/zarr-developers/zarr-python/tree/v3.3.0 (URL)
Software
- Repository URL
- https://github.com/zarr-developers/zarr-python