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ScipyArrayWrapper' object has no attribute 'oindex' #8909

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Description

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What happened?

Exception ScipyArrayWrapper' object has no attribute 'oindex' when trying to save dataset into netcdf file after selecting subset from dataset previously loaded from another netcdf file.

What did you expect to happen?

No response

Minimal Complete Verifiable Example

import xarray as xr

ds = xr.Dataset()
ds['A'] = xr.DataArray([[1, 'a'], [2,'b']],dims=['x','y'])
ds.to_netcdf('test.nc')
ds2 = xr.open_dataset('test.nc')
ds2.sel(y=[1]).to_netcdf('test.nc')

MVCE confirmation

  • Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • Complete example — the example is self-contained, including all data and the text of any traceback.
  • Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • New issue — a search of GitHub Issues suggests this is not a duplicate.
  • Recent environment — the issue occurs with the latest version of xarray and its dependencies.

Relevant log output

File ~/Workspace/phd/.venv/lib/python3.10/site-packages/xarray/core/indexing.py:342, in IndexCallable.__getitem__(self, key)
    341 def __getitem__(self, key: Any) -> Any:
--> 342     return self.getter(key)

File ~/Workspace/phd/.venv/lib/python3.10/site-packages/xarray/coding/variables.py:72, in _ElementwiseFunctionArray._oindex_get(self, key)
     71 def _oindex_get(self, key):
---> 72     return type(self)(self.array.oindex[key], self.func, self.dtype)

File ~/Workspace/phd/.venv/lib/python3.10/site-packages/xarray/core/indexing.py:342, in IndexCallable.__getitem__(self, key)
    341 def __getitem__(self, key: Any) -> Any:
--> 342     return self.getter(key)

File ~/Workspace/phd/.venv/lib/python3.10/site-packages/xarray/coding/strings.py:256, in StackedBytesArray._oindex_get(self, key)
    255 def _oindex_get(self, key):
--> 256     return _numpy_char_to_bytes(self.array.oindex[key])

AttributeError: 'ScipyArrayWrapper' object has no attribute 'oindex'

Anything else we need to know?

No response

Environment

INSTALLED VERSIONS ------------------ commit: None python: 3.10.8 | packaged by conda-forge | (main, Nov 22 2022, 08:26:04) [GCC 10.4.0] python-bits: 64 OS: Linux OS-release: 6.5.0-26-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.14.2 libnetcdf: None

xarray: 2024.3.0
pandas: 2.2.1
numpy: 1.26.4
scipy: 1.13.0
netCDF4: None
pydap: None
h5netcdf: None
h5py: 3.10.0
Nio: None
zarr: None
cftime: None
nc_time_axis: None
iris: None
bottleneck: 1.3.8
dask: 2024.4.0
distributed: 2024.4.0
matplotlib: 3.8.4
cartopy: None
seaborn: 0.13.2
numbagg: None
fsspec: 2024.3.1
cupy: None
pint: None
sparse: None
flox: 0.9.6
numpy_groupies: 0.10.2
setuptools: 63.2.0
pip: 24.0
conda: None
pytest: 8.1.1
mypy: None
IPython: 8.23.0
sphinx: None

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