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/1366#issuecomment-890133782,https://api.github.com/repos/pydata/xarray/issues/1366,890133782,IC_kwDOAMm_X841Dl0W,4160723,2021-07-30T20:21:48Z,2021-07-30T20:21:48Z,MEMBER,"#5636 is a 1st step towards representing multi-index levels in separate `Variable` objects having their own user-defined attributes. We'll also be able in theory to propagate the attributes through operations like `sel` and maybe other operations like alignment.

The features added in #5636 will be integrated in a follow-up PR.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,220533356
https://github.com/pydata/xarray/issues/1366#issuecomment-471766745,https://api.github.com/repos/pydata/xarray/issues/1366,471766745,MDEyOklzc3VlQ29tbWVudDQ3MTc2Njc0NQ==,1217238,2019-03-11T22:34:17Z,2019-03-11T22:34:17Z,MEMBER,This will be eventually fixed as part of https://github.com/pydata/xarray/issues/1603,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,220533356
https://github.com/pydata/xarray/issues/1366#issuecomment-471419156,https://api.github.com/repos/pydata/xarray/issues/1366,471419156,MDEyOklzc3VlQ29tbWVudDQ3MTQxOTE1Ng==,26384082,2019-03-11T06:27:49Z,2019-03-11T06:27:49Z,NONE,"In order to maintain a list of currently relevant issues, we mark issues as stale after a period of inactivity

If this issue remains relevant, please comment here or remove the `stale` label; otherwise it will be marked as closed automatically
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,220533356
https://github.com/pydata/xarray/issues/1366#issuecomment-292853553,https://api.github.com/repos/pydata/xarray/issues/1366,292853553,MDEyOklzc3VlQ29tbWVudDI5Mjg1MzU1Mw==,7799184,2017-04-10T05:32:29Z,2017-04-10T05:32:29Z,CONTRIBUTOR,That makes sense thanks for explaining @shoyer ,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,220533356
https://github.com/pydata/xarray/issues/1366#issuecomment-292847045,https://api.github.com/repos/pydata/xarray/issues/1366,292847045,MDEyOklzc3VlQ29tbWVudDI5Mjg0NzA0NQ==,1217238,2017-04-10T04:27:02Z,2017-04-10T04:27:02Z,MEMBER,"This is a little tricky: there's only a single array `Variable` object (the MultiIndex), so we can't save `attrs` on any of the levels. But xarray doesn't raise an error in this case, because it's assigning to the temporary `mda['band']` object, which immediately gets thrown away. There would be the same issue if you tried to assign an attribute to `ds['time.dayofyear']`.

I don't think Python syntax gives us any good options for identifying these cases. It's essentially the same problem as assigning to an indexing result, e.g., `ds.sel(...).attrs = ...`, though it's less obvious here since you're doing indexing, not a method call.

At the very least we could document that this doesn't work.

CC @benbovy in case he has any other ideas.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,220533356