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  • DataArray attributes not present in DataSet. Coherency problem between DataSet and NetCDF file · 2 ✖

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  • NONE · 2 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
829638401 https://github.com/pydata/xarray/issues/5208#issuecomment-829638401 https://api.github.com/repos/pydata/xarray/issues/5208 MDEyOklzc3VlQ29tbWVudDgyOTYzODQwMQ== JavierRuano 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)

 
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   DataArray attributes not present in DataSet. Coherency problem between DataSet and NetCDF file 865003095
828423751 https://github.com/pydata/xarray/issues/5208#issuecomment-828423751 https://api.github.com/repos/pydata/xarray/issues/5208 MDEyOklzc3VlQ29tbWVudDgyODQyMzc1MQ== oliviermarti 2853966 2021-04-28T12:43:06Z 2021-04-28T12:43:06Z NONE

dcherian, thank you for your help.

But a problem (feature ?) remains : when a Dataset is created, the command print(Dataset) doesn't show variables attributes. But attributes are shown when the Dataset is readed in a NetCDF file. Is there a reason for this difference a behaviour ?

Olivier

 
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   DataArray attributes not present in DataSet. Coherency problem between DataSet and NetCDF file 865003095

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