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issues: 220533356

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
220533356 MDU6SXNzdWUyMjA1MzMzNTY= 1366 Setting attributes to multi-index coordinate 7799184 closed 0     5 2017-04-10T04:11:12Z 2022-03-17T17:11:40Z 2022-03-17T17:11:40Z CONTRIBUTOR      

I can't seem to be able to define attributes to "virtual" coordinates from multi-index coordinates. Taking from the exemple from the docs: ```python In [1]: import numpy as np In [2]: import pandas as pd In [3]: import xarray as xr In [4]: midx = pd.MultiIndex.from_arrays([['R','R','V','V'], [.1,.2,.7,.9]], names=('band','wn')) In [5]: mda = xr.DataArray(np.random.rand(4), coords={'spec': midx}, dims='spec')

Setting up attrs to the full coordinate works:

In [6]: mda['spec'].attrs Out[6]: OrderedDict() In [7]: mda['spec'].attrs = {'spec_attr': 'some_attr'} In [8]: mda['spec'].attrs Out[8]: OrderedDict([('spec_attr', 'some_attr')])

Setting attrs to the virtual coordinate does not produce any effect:

In [9]: mda['band'].attrs Out[9]: OrderedDict() In [10]: mda['band'].attrs = {'band_attr': 'another_attr'} In [11]: mda['band'].attrs Out[11]: OrderedDict() ```

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