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/4821#issuecomment-762710092,https://api.github.com/repos/pydata/xarray/issues/4821,762710092,MDEyOklzc3VlQ29tbWVudDc2MjcxMDA5Mg==,10194086,2021-01-19T09:17:07Z,2021-01-19T09:17:07Z,MEMBER,"Ah yes you are right... However, we are not consistent with this, e.g. that works for reductions `air.mean((""lat"", ""lon""))`","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,787847449
https://github.com/pydata/xarray/issues/4821#issuecomment-762521955,https://api.github.com/repos/pydata/xarray/issues/4821,762521955,MDEyOklzc3VlQ29tbWVudDc2MjUyMTk1NQ==,10194086,2021-01-19T00:04:30Z,2021-01-19T00:04:30Z,MEMBER,"Yes, I am marking that as a bug. The problem is here:

https://github.com/pydata/xarray/blob/295606707a0464cd13727794a979f5b709cd92a1/xarray/core/dataset.py#L5612-L5613

as the tuple is not a list it ends up as `[('x', 'y')]`. That should probably be
```python
if isinstance(variables, str):
    variables = [variables]
```
or
```python
if not isinstance(variables, (list, tuple)):
    variables = [variables]
```


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