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/pull/2850#issuecomment-479556697,https://api.github.com/repos/pydata/xarray/issues/2850,479556697,MDEyOklzc3VlQ29tbWVudDQ3OTU1NjY5Nw==,1217238,2019-04-03T16:11:41Z,2019-04-03T16:11:41Z,MEMBER,"Yes, you can put these in a netCDF3 file (even with the latest netCDF-C library).","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,424916834
https://github.com/pydata/xarray/pull/2850#issuecomment-479547573,https://api.github.com/repos/pydata/xarray/issues/2850,479547573,MDEyOklzc3VlQ29tbWVudDQ3OTU0NzU3Mw==,10050469,2019-04-03T15:48:22Z,2019-04-03T15:48:22Z,MEMBER,"Thanks! @shoyer ! I guess the file I was working with must have been created with nectdf3 then, because otherwise I don't know how they managed to write this out...","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,424916834
https://github.com/pydata/xarray/pull/2850#issuecomment-479539924,https://api.github.com/repos/pydata/xarray/issues/2850,479539924,MDEyOklzc3VlQ29tbWVudDQ3OTUzOTkyNA==,1217238,2019-04-03T15:30:05Z,2019-04-03T15:30:05Z,MEMBER,"I think this is actually due to something in the netCDF C library: `CLASS` is a special attribute name used by HDF5 dimension scales. Note that it works fine to save an attribute with the name `class` (the Python keyword).

Here's the list of prohibited attributes from the netCDF spec:
https://www.unidata.ucar.edu/software/netcdf/docs/file_format_specifications.html#atts_spec

h5netcdf uses this list to issue more informative error messages:
https://github.com/shoyer/h5netcdf/blob/3ae35cd58297281a1dc69c46fb0b315a0007ac2b/h5netcdf/attrs.py#L22-L24","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,424916834
https://github.com/pydata/xarray/pull/2850#issuecomment-479528667,https://api.github.com/repos/pydata/xarray/issues/2850,479528667,MDEyOklzc3VlQ29tbWVudDQ3OTUyODY2Nw==,10050469,2019-04-03T15:03:19Z,2019-04-03T15:03:19Z,MEMBER,"> It's very python related

I'm saying this because this happened with a real file I was working with. The file had a `CLASS` attribute on a variable, it can be read by xarray but not written out... ","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,424916834
https://github.com/pydata/xarray/pull/2850#issuecomment-479527736,https://api.github.com/repos/pydata/xarray/issues/2850,479527736,MDEyOklzc3VlQ29tbWVudDQ3OTUyNzczNg==,10050469,2019-04-03T15:01:12Z,2019-04-03T15:01:12Z,MEMBER,"> One more request: can you link to a list of disallowed names in the docs somewhere?

I don't know if such a list exists. Do you know? It's very python related, because of `setattr`. It's confusing that it's only making a problem on variable objects, not on datasets. 

So altogether I wouldn't worry much here, this is really an edge case.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,424916834
https://github.com/pydata/xarray/pull/2850#issuecomment-479522682,https://api.github.com/repos/pydata/xarray/issues/2850,479522682,MDEyOklzc3VlQ29tbWVudDQ3OTUyMjY4Mg==,2448579,2019-04-03T14:49:17Z,2019-04-03T14:49:17Z,MEMBER,"One more request: can you link to a list of disallowed names in the docs somewhere?

I also wonder if the error message should suggest that the user look up this list.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,424916834
https://github.com/pydata/xarray/pull/2850#issuecomment-479382381,https://api.github.com/repos/pydata/xarray/issues/2850,479382381,MDEyOklzc3VlQ29tbWVudDQ3OTM4MjM4MQ==,10050469,2019-04-03T08:00:40Z,2019-04-03T08:00:40Z,MEMBER,"Done! Didn't edit ""what's new"" because this is a tiny change.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,424916834