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Use zarr-python default open mode when opening arrays #10430

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Use zarr-python default open mode when opening arrays #10430

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Use zarr-python default open mode when opening arrays
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@dstansby
dstansby committed Jun 18, 2025
commit 96e5233122ec1346a21f80446d6598aeb86c30b9
7 changes: 5 additions & 2 deletions xarray/backends/zarr.py
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Original file line number Diff line number Diff line change
Expand Up @@ -639,7 +639,7 @@ def open_store(
def open_group(
cls,
store,
mode: ZarrWriteModes = "r",
mode: ZarrWriteModes | None = None,
synchronizer=None,
group=None,
consolidated=False,
Expand Down Expand Up @@ -1561,7 +1561,7 @@ def open_dataset(
use_cftime=None,
decode_timedelta=None,
group=None,
mode="r",
mode=None,
synchronizer=None,
consolidated=None,
chunk_store=None,
Expand Down Expand Up @@ -1746,6 +1746,9 @@ def _get_open_params(
synchronizer=synchronizer,
path=group,
)
if mode is None:
# Let zarr-python use its default open mode
open_kwargs.pop("mode")
open_kwargs["storage_options"] = storage_options

zarr_format = _handle_zarr_version_or_format(
Expand Down
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