html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
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.","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,376953925
https://github.com/pydata/xarray/issues/2537#issuecomment-435553730,https://api.github.com/repos/pydata/xarray/issues/2537,435553730,MDEyOklzc3VlQ29tbWVudDQzNTU1MzczMA==,5635139,2018-11-03T02:30:06Z,2018-11-03T02:31:51Z,MEMBER,"Thanks @mschrimpf 

Could you clarify the intended output? ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,376953925
https://github.com/pydata/xarray/issues/2537#issuecomment-435526670,https://api.github.com/repos/pydata/xarray/issues/2537,435526670,MDEyOklzc3VlQ29tbWVudDQzNTUyNjY3MA==,5635139,2018-11-02T22:24:02Z,2018-11-02T22:24:02Z,MEMBER,"Thanks for the issue @mschrimpf 

The coord is there:

```python
In [2]: d
Out[2]:
<xarray.DataArray (dim: 1)>
array([0])
Coordinates:
    coord    (dim) int64 0
Dimensions without coordinates: dim

```

...but `.sel` doesn't accept coordinate names, only on dimensions.

Is your issue that `sel` should accept coordinate names? ","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,376953925