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/5208#issuecomment-829638401,https://api.github.com/repos/pydata/xarray/issues/5208,829638401,MDEyOklzc3VlQ29tbWVudDgyOTYzODQwMQ==,34353851,2021-04-29T22:33:05Z,2021-04-29T22:33:05Z,NONE,"import numpy  as np
import xarray as xr

# Creates DataArrays
nt = 4
time = np.arange (nt) * 86400.0
time = xr.DataArray (time, coords=[time,], dims=[""time"",])
aa   = time * 2.0

# Adding attributes to DataArrays
time.attrs['units'] = ""second""
aa.attrs['units']   = ""whatever""

# Attributes are visible in the DataArrays
print ('----------> time DataArray: ')
print (time)
print ('----------> aa DataArray : ' )
print (aa)
print ('----------> aa attributes : ')
print (aa.attrs )

# Creating a Dataset
ds = xr.Dataset(
    { ""aa"": ([""time"",], aa),  },
    coords={""time"": ([""time"",], time), },   ) 

# Attributes are not visible in the Dataset
print ('----------> DataSet before setting attributes')
print (ds)
# My request #1 : attributes of the DataArrays should be added to the DataSet (may be optional)
print ('----------> Attributes of aa in DataSet : none')
print ( ds['aa'].attrs )
print ('----------> Attributes of aa outside DataSet : still here')
print ( aa.attrs )

print ('----------> Attributes are not written to the NetCDF file')
ds.to_netcdf ('sample1.nc')

# Adding attributes directly to the Dataset


# Attributes are still not visible in the Dataset
print ('----------> DataSet after setting attributes : attributes not shown' )
ds=ds.assign_attrs({'Visible':'NotInvisibleMan'})
ds['time'].attrs['units']=""second""
ds['aa'].attrs['units']=""whatever""    
ds.to_netcdf('safeReturn.nc')
print(xr.open_dataset('safeReturn.nc').attrs)
print(xr.open_dataset('safeReturn.nc')['aa'].attrs)
print(xr.open_dataset('safeReturn.nc')['time'].attrs)","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,865003095