zarr-python

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Permission denied when multiple Processes write to the same file

3

### Zarr version 3.1.3 ### Numcodecs version 0.16.3 ### Python Version 3.13.4 ### Operating System Windows 11 24H2 ### Installation using pip into virtual environment ### Description I am encountering...

Trobolt

Writing dask arrays to a ZipStore causes a corrupt zip file

7

### Zarr version 3.1.3 ### Numcodecs version 0.16.1 ### Python Version 3.11.3 ### Operating System Linux ### Installation Via binder, with xarray's blank_template.ipynb documentation example ### Description When dask provides...

csubich

Arrow ipc Array -> Bytes codec

2

Implementation of `arrow-ipc` Array Bytes codec proposed in https://github.com/zarr-developers/zarr-extensions/pull/41 TODO: * [x] Add unit tests and/or doctests in docstrings * [ ] Add docstrings and API docs for any new/modified...

rabernat

Remove deprecated API

1

Fixes https://github.com/zarr-developers/zarr-python/issues/3317. I'm going to leave this as draft, because it will probably be easier to manage backports if this is merged as the last thing before a 3.2.0 release,...

dstansby

Tolerate 403 HTTP codes in S3 stores as "non existing" objects

4

Dear all, I have a request for Zarr-Python related to their S3 stores (fsspec, obstore). Under certain circumstances, accessing a Zarr datacube in S3 can lead to 403 responses, which...

jordi-domingo

For all `_iter_shard` methods and functions there is a fallback to chunks when no shards are present, but this is not clear from either the name or the docstring. Though...

melonora

Iterative Shard Writing ala TensorStore Transactions / TensorStore `chunk_layout.write_chunk`

7

### Describe the new feature you'd like Hi, I saw a comment [comment on the ossci zulip][comment-link] by @mkitti where he raised the idea for creating a simplified version of...

srivarra

Error trying to assign slice of a Zarr array to another Zarr array

6

### Zarr version 3.1.6.dev5+gee0e69a74 ### Numcodecs version 0.6.15 ### Python Version 3.12.8 ### Operating System macOS ### Installation From source ### Description Trying to assign to a slice of a...

dstansby

updates: - [github.com/astral-sh/ruff-pre-commit: v0.14.3 → v0.14.7](https://github.com/astral-sh/ruff-pre-commit/compare/v0.14.3...v0.14.7) - [github.com/pre-commit/mirrors-mypy: v1.18.2 → v1.19.0](https://github.com/pre-commit/mirrors-mypy/compare/v1.18.2...v1.19.0) - [github.com/scientific-python/cookie: 2025.10.20 → 2025.11.21](https://github.com/scientific-python/cookie/compare/2025.10.20...2025.11.21)

pre-commit-ci[bot]

# Issue Metrics | Metric | Average | Median | 90th percentile | | --- | --- | --- | ---: | | Time to first response | 3:00:31 |...

github-actions[bot]