issue_comments: 479539924

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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

 
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