issue_comments: 369543072

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https://github.com/pydata/xarray/issues/1849#issuecomment-369543072 https://api.github.com/repos/pydata/xarray/issues/1849 369543072 MDEyOklzc3VlQ29tbWVudDM2OTU0MzA3Mg== 8441217 2018-03-01T10:09:40Z 2018-03-01T10:09:40Z CONTRIBUTOR

I also ran into this issue : to_netcdf fails for my dataset.

Here is how to reproduce the error : (the testfile is attached here 1.zip )

import netCDF4 import xarray as xr print(netCDF4.__version__) print(xr.__version__) ds = xr.open_dataset('testfile') ds.to_netcdf('outfile.ok') ds.to_netcdf('outfile.not.ok', unlimited_dims=['datetime'])

And the ouput I get :

1.3.1 0.10.1 Traceback (most recent call last): File "bug.py", line 6, in <module> ds.to_netcdf('outfile', unlimited_dims=['datetime']) File "/home/pinaultf/miniconda3/envs/defaultenv/lib/python3.6/site-packages/xarray/core/dataset.py", line 1133, in to_netcdf unlimited_dims=unlimited_dims) File "/home/pinaultf/miniconda3/envs/defaultenv/lib/python3.6/site-packages/xarray/backends/api.py", line 632, in to_netcdf unlimited_dims=unlimited_dims) File "/home/pinaultf/miniconda3/envs/defaultenv/lib/python3.6/site-packages/xarray/core/dataset.py", line 1070, in dump_to_store unlimited_dims=unlimited_dims) File "/home/pinaultf/miniconda3/envs/defaultenv/lib/python3.6/site-packages/xarray/backends/common.py", line 280, in store unlimited_dims=unlimited_dims) File "/home/pinaultf/miniconda3/envs/defaultenv/lib/python3.6/site-packages/xarray/backends/netCDF4_.py", line 348, in set_variables super(NetCDF4DataStore, self).set_variables(args, *kwargs) File "/home/pinaultf/miniconda3/envs/defaultenv/lib/python3.6/site-packages/xarray/backends/common.py", line 317, in set_variables name, v, check, unlimited_dims=unlimited_dims) File "/home/pinaultf/miniconda3/envs/defaultenv/lib/python3.6/site-packages/xarray/backends/netCDF4_.py", line 393, in prepare_variable fill_value=fill_value) File "netCDF4/_netCDF4.pyx", line 2437, in netCDF4._netCDF4.Dataset.createVariable File "netCDF4/_netCDF4.pyx", line 3439, in netCDF4._netCDF4.Variable.init File "netCDF4/_netCDF4.pyx", line 1638, in netCDF4._netCDF4._ensure_nc_success RuntimeError: NetCDF: Invalid argument 

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