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/1681#issuecomment-341241720,https://api.github.com/repos/pydata/xarray/issues/1681,341241720,MDEyOklzc3VlQ29tbWVudDM0MTI0MTcyMA==,2656596,2017-11-01T21:03:10Z,2017-11-02T04:45:12Z,NONE,"Thanks for the reply.
I'm currently using netcdf4 version 1.2.2, which seems slightly old but that's the default conda package.
Ok, so just to clarify...
The `TypeError` is correct in stating that each attribute value must be ""a number, string, ndarray or a list/tuple of numbers/strings""?
Those are the only options, correct?

Thanks again.
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,270440308
https://github.com/pydata/xarray/issues/1681#issuecomment-341245412,https://api.github.com/repos/pydata/xarray/issues/1681,341245412,MDEyOklzc3VlQ29tbWVudDM0MTI0NTQxMg==,1217238,2017-11-01T21:16:46Z,2017-11-01T21:16:46Z,MEMBER,"Yes, I think that's correct.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,270440308
https://github.com/pydata/xarray/issues/1681#issuecomment-341238029,https://api.github.com/repos/pydata/xarray/issues/1681,341238029,MDEyOklzc3VlQ29tbWVudDM0MTIzODAyOQ==,1217238,2017-11-01T20:49:50Z,2017-11-01T20:49:50Z,MEMBER,"Which netCDF library were you using? I don't think netCDF as a file format has ever supported maps as attributes.

For example, looking at [the spec](http://www.unidata.ucar.edu/software/netcdf/docs/file_format_specifications.html), attributes can be a variable-length array of any scalar type (this is specifically for netCDF3, but the rules for netCDF4 are similar):
```
     attr         = name  nc_type  nelems  [values ...]
     nc_type      = NC_BYTE   |
                    NC_CHAR   |
                    NC_SHORT  |
                    NC_INT    |
                    NC_FLOAT  |
                    NC_DOUBLE
```

In practice, I believe Python APIs (including xarray's various netCDF backends) usually decode single values to scalars.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,270440308