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  • dcherian · 1 ✖

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  • Dropping a MultiIndex variable raises an error after explicit indexes refactor · 1 ✖

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1117682042 https://github.com/pydata/xarray/issues/6505#issuecomment-1117682042 https://api.github.com/repos/pydata/xarray/issues/6505 IC_kwDOAMm_X85Cnnl6 dcherian 2448579 2022-05-04T18:43:41Z 2022-05-04T18:43:41Z MEMBER

Here's another version of the same bug affecting `Dataset.assign) ``` python import xarray

array = xarray.DataArray( [[1, 2], [3, 4]], dims=['x', 'y'], coords={'x': ['a', 'b']}, ) stacked = array.stack(z=['x', 'y']).to_dataset(name="a") stacked.assign_coords(f1=2stacked.a) # works stacked.assign(f2=2stacked.a) # error ```

``` --------------------------------------------------------------------------- ValueError Traceback (most recent call last) Input In [33], in <cell line: 10>() 8 stacked = array.stack(z=['x', 'y']).to_dataset(name="a") 9 stacked.assign_coords(f1=2*stacked.a) ---> 10 stacked.assign(f2=2*stacked.a) File ~/work/python/xarray/xarray/core/dataset.py:5444, in Dataset.assign(self, variables, **variables_kwargs) 5442 results = data._calc_assign_results(variables) 5443 # ... and then assign -> 5444 data.update(results) 5445 return data File ~/work/python/xarray/xarray/core/dataset.py:4421, in Dataset.update(self, other) 4385 def update(self, other: CoercibleMapping) -> Dataset: 4386 """Update this dataset's variables with those from another dataset. 4387 4388 Just like :py:meth:`dict.update` this is a in-place operation. (...) 4419 Dataset.merge 4420 """ -> 4421 merge_result = dataset_update_method(self, other) 4422 return self._replace(inplace=True, **merge_result._asdict()) File ~/work/python/xarray/xarray/core/merge.py:1068, in dataset_update_method(dataset, other) 1062 coord_names = [ 1063 c 1064 for c in value.coords 1065 if c not in value.dims and c in dataset.coords 1066 ] 1067 if coord_names: -> 1068 other[key] = value.drop_vars(coord_names) 1070 return merge_core( 1071 [dataset, other], 1072 priority_arg=1, 1073 indexes=dataset.xindexes, 1074 combine_attrs="override", 1075 ) File ~/work/python/xarray/xarray/core/dataarray.py:2406, in DataArray.drop_vars(self, names, errors) 2387 def drop_vars( 2388 self, names: Hashable | Iterable[Hashable], *, errors: str = "raise" 2389 ) -> DataArray: 2390 """Returns an array with dropped variables. 2391 2392 Parameters (...) 2404 New Dataset copied from `self` with variables removed. 2405 """ -> 2406 ds = self._to_temp_dataset().drop_vars(names, errors=errors) 2407 return self._from_temp_dataset(ds) File ~/work/python/xarray/xarray/core/dataset.py:4549, in Dataset.drop_vars(self, names, errors) 4546 if errors == "raise": 4547 self._assert_all_in_dataset(names) -> 4549 assert_no_index_corrupted(self.xindexes, names) 4551 variables = {k: v for k, v in self._variables.items() if k not in names} 4552 coord_names = {k for k in self._coord_names if k in variables} File ~/work/python/xarray/xarray/core/indexes.py:1394, in assert_no_index_corrupted(indexes, coord_names) 1392 common_names_str = ", ".join(f"{k!r}" for k in common_names) 1393 index_names_str = ", ".join(f"{k!r}" for k in index_coords) -> 1394 raise ValueError( 1395 f"cannot remove coordinate(s) {common_names_str}, which would corrupt " 1396 f"the following index built from coordinates {index_names_str}:\n" 1397 f"{index}" 1398 ) ValueError: cannot remove coordinate(s) 'y', 'x', which would corrupt the following index built from coordinates 'z', 'x', 'y': <xarray.core.indexes.PandasMultiIndex object at 0x16d3a6430> ``` 
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   Dropping a MultiIndex variable raises an error after explicit indexes refactor 1210267320

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