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https://github.com/pydata/xarray/issues/7139#issuecomment-1272922855 https://api.github.com/repos/pydata/xarray/issues/7139 1272922855 IC_kwDOAMm_X85L30Ln 21131639 2022-10-10T07:59:01Z 2022-10-10T07:59:01Z CONTRIBUTOR

Here is the full stacktrace:

```python

ValueError Traceback (most recent call last) Cell In [12], line 7 ----> 7 loaded = xr.open_dataset("multiindex.nc", engine="netcdf4-multiindex", handle_multiindex=True) 8 print(loaded)

File ~/.local/share/virtualenvs/test-oePfdNug/lib/python3.8/site-packages/xarray/backends/api.py:537, in open_dataset(filename_or_obj, engine, chunks, cache, decode_cf, mask_and_scale, decode_times, decode_timedelta, use_cftime, concat_characters, decode_coords, drop_variables, inline_array, backend_kwargs, kwargs) 530 overwrite_encoded_chunks = kwargs.pop("overwrite_encoded_chunks", None) 531 backend_ds = backend.open_dataset( 532 filename_or_obj, 533 drop_variables=drop_variables, 534 decoders, 535 kwargs, 536 ) --> 537 ds = _dataset_from_backend_dataset( 538 backend_ds, 539 filename_or_obj, 540 engine, 541 chunks, 542 cache, 543 overwrite_encoded_chunks, 544 inline_array, 545 drop_variables=drop_variables, 546 decoders, 547 **kwargs, 548 ) 549 return ds

File ~/.local/share/virtualenvs/test-oePfdNug/lib/python3.8/site-packages/xarray/backends/api.py:345, in _dataset_from_backend_dataset(backend_ds, filename_or_obj, engine, chunks, cache, overwrite_encoded_chunks, inline_array, **extra_tokens) 340 if not isinstance(chunks, (int, dict)) and chunks not in {None, "auto"}: 341 raise ValueError( 342 f"chunks must be an int, dict, 'auto', or None. Instead found {chunks}." 343 ) --> 345 _protect_dataset_variables_inplace(backend_ds, cache) 346 if chunks is None: 347 ds = backend_ds

File ~/.local/share/virtualenvs/test-oePfdNug/lib/python3.8/site-packages/xarray/backends/api.py:239, in _protect_dataset_variables_inplace(dataset, cache) 237 if cache: 238 data = indexing.MemoryCachedArray(data) --> 239 variable.data = data

File ~/.local/share/virtualenvs/test-oePfdNug/lib/python3.8/site-packages/xarray/core/variable.py:2795, in IndexVariable.data(self, data) 2793 @Variable.data.setter # type: ignore[attr-defined] 2794 def data(self, data): -> 2795 raise ValueError( 2796 f"Cannot assign to the .data attribute of dimension coordinate a.k.a IndexVariable {self.name!r}. " 2797 f"Please use DataArray.assign_coords, Dataset.assign_coords or Dataset.assign as appropriate." 2798 )

ValueError: Cannot assign to the .data attribute of dimension coordinate a.k.a IndexVariable 'measurement'. Please use DataArray.assign_coords, Dataset.assign_coords or Dataset.assign as appropriate. ```

 
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