issue_comments: 435602025

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https://github.com/pydata/xarray/issues/2537#issuecomment-435602025 https://api.github.com/repos/pydata/xarray/issues/2537 435602025 MDEyOklzc3VlQ29tbWVudDQzNTYwMjAyNQ== 5635139 2018-11-03T16:38:23Z 2018-11-03T16:38:23Z MEMBER

Thanks!

I agree. For a comparable case when a list of length 2 is passed:

```python

d = xr.DataArray([0], coords={'coord1': ('dim', [0]), 'coord2': ('dim', [1])}, dims=['dim'])

In [22]: d Out[22]: <xarray.DataArray (dim: 1)> array([0]) Coordinates: coord2 (dim) int64 1 coord1 (dim) int64 0 Dimensions without coordinates: dim

In [23]: d.set_index(append=True, dim=['coord1','coord2']) Out[23]: <xarray.DataArray (dim: 1)> array([0]) Coordinates: * dim (dim) MultiIndex - coord1 (dim) int64 0 - coord2 (dim) int64 1 ```

I think the rule should be that if a list is passed, it's a multi-index, as per the doc-string.

 
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