issues: 314457748
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| 314457748 | MDU6SXNzdWUzMTQ0NTc3NDg= | 2060 | Confusing error message when attribute not equal during concat | 1828519 | closed | 0 | 3 | 2018-04-15T22:20:12Z | 2019-12-24T13:37:04Z | 2019-12-24T13:37:04Z | CONTRIBUTOR | Code Sample, a copy-pastable example if possible```python In [1]: import dask.array as da; import xarray as xr; import numpy as np In [2]: a = xr.DataArray(da.random.random((4, 6), chunks=2), attrs={'test': ['x1', 'y1']}, dims=('y', 'x')) In [3]: b = xr.DataArray(da.random.random((4, 6), chunks=2), attrs={'test': ['x2', 'y2']}, dims=('y', 'x')) In [4]: xr.concat([a, b], 'y')ValueError Traceback (most recent call last) <ipython-input-4-c8b32db4cfb7> in <module>() ----> 1 xr.concat([a, b], 'y') ~/anaconda/envs/polar2grid_py36/lib/python3.6/site-packages/xarray/core/combine.py in concat(objs, dim, data_vars, coords, compat, positions, indexers, mode, concat_over) 119 raise TypeError('can only concatenate xarray Dataset and DataArray ' 120 'objects, got %s' % type(first_obj)) --> 121 return f(objs, dim, data_vars, coords, compat, positions) 122 123 ~/anaconda/envs/polar2grid_py36/lib/python3.6/site-packages/xarray/core/combine.py in _dataarray_concat(arrays, dim, data_vars, coords, compat, positions) 337 338 ds = _dataset_concat(datasets, dim, data_vars, coords, compat, --> 339 positions) 340 return arrays[0]._from_temp_dataset(ds, name) 341 ~/anaconda/envs/polar2grid_py36/lib/python3.6/site-packages/xarray/core/combine.py in _dataset_concat(datasets, dim, data_vars, coords, compat, positions) 303 if k in concat_over: 304 vars = ensure_common_dims([ds.variables[k] for ds in datasets]) --> 305 combined = concat_vars(vars, dim, positions) 306 insert_result_variable(k, combined) 307 ~/anaconda/envs/polar2grid_py36/lib/python3.6/site-packages/xarray/core/variable.py in concat(variables, dim, positions, shortcut) 1772 return IndexVariable.concat(variables, dim, positions, shortcut) 1773 else: -> 1774 return Variable.concat(variables, dim, positions, shortcut) 1775 1776 ~/anaconda/envs/polar2grid_py36/lib/python3.6/site-packages/xarray/core/variable.py in concat(cls, variables, dim, positions, shortcut) 1299 if var.dims != first_var.dims: 1300 raise ValueError('inconsistent dimensions') -> 1301 utils.remove_incompatible_items(attrs, var.attrs) 1302 1303 return cls(dims, data, attrs, encoding) ~/anaconda/envs/polar2grid_py36/lib/python3.6/site-packages/xarray/core/utils.py in remove_incompatible_items(first_dict, second_dict, compat) 157 if (k not in second_dict or 158 (k in second_dict and --> 159 not compat(first_dict[k], second_dict[k]))): 160 del first_dict[k] 161 ~/anaconda/envs/polar2grid_py36/lib/python3.6/site-packages/xarray/core/utils.py in equivalent(first, second) 106 return ((first is second) or 107 (first == second) or --> 108 (pd.isnull(first) and pd.isnull(second))) 109 110 ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all() ``` Problem descriptionIf two or more Expected OutputI guess the expected result would be that the list attribute is not included in the resulting DataArray's attributes. Output of
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