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  • tovogt · 1 ✖

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  • netCDF4: support byte strings as attribute values · 1 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1287864880 https://github.com/pydata/xarray/issues/7186#issuecomment-1287864880 https://api.github.com/repos/pydata/xarray/issues/7186 IC_kwDOAMm_X85Mw0Iw tovogt 57705593 2022-10-22T17:37:05Z 2022-10-22T17:37:41Z CONTRIBUTOR

The reason for this behavior is that the netcdf4 python package automatically determines the type of the attribute (NC_CHAR or NC_STRING) by attempting the conversion to ASCII: https://github.com/Unidata/netcdf4-python/issues/529 However, if the value is a byte string, no conversion is done. So, the easiest solution would be to manually encode as utf-8 and then passing the byte string to netcdf4. Unfortunately, xarray doesn't support byte strings as attribute values even though this is a valid data type for the netcdf4 engine: https://github.com/pydata/xarray/blob/6cb97f645475bddf2f3b1e1a5f24f0f9de690683/xarray/backends/api.py#L175 In the long term, I would suggest to add bytes as a supported type in that list above on xarray's side.

A quick workaround for you might be to encode the string as utf-8 and convert to a numpy array, since xarray accepts numpy arrays as data type and netcdf4 automatically extracts the data if the array contains only a single item: python ds["x"].attrs["third_str"] = np.array("hää".encode("utf-8"))

 
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   netCDF4: support byte strings as attribute values 1414669747

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