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532647948 MDU6SXNzdWU1MzI2NDc5NDg= 3593 xr.open_dataset not reloading data in jupyter-notebook lkroen 58510627 closed 0     1 2019-12-04T12:17:13Z 2022-04-09T02:27:17Z 2022-04-09T02:27:17Z NONE      

First, I reported this issue on Jupyter-Notebook and was told, that it might be an issue of xarry: https://github.com/jupyter/notebook/issues/5101

I load an .nc file and print it

Cell 1 python 3 import xarray as xr data_file = 'path_to_file/WMI_Lear.nc'

Cell 2 python 3 data = '' data = xr.open_dataset(data_file) print(data)

and I get the correct output: python <xarray.Dataset> Dimensions: (time: 180) Coordinates: * time (time) datetime64[ns] 2003-07-06T06:30:13 ... 2003-07-06T06:59:59 Data variables: altitude (time) float32 ... latitude (time) float32 ... longitude (time) float32 ... pressure (time) float32 ... tdry (time) float32 ... dp (time) float32 ... mr (time) float32 ... wspd (time) float32 ... wdir (time) float32 ... Drops (time) float64 ... Attributes: history: $Id: TrackFile.java,v 1.20 2003/05/07 04:53:23 maclean Exp $

Now I (re)move the data in a terminal so that does not exist under the same name bash mv path_to_file/WMI_Lear.nc path_to_file/WMI_Lear.nc_new

Cell 3 python 3 data = '' data = xr.open_dataset(data_file) print(data)

and I correctly get an error, that the file does not exist python FileNotFoundError: [Errno 2] No such file or directory: b'/path_to_file/WMI_Lear.nc'

Now I move the data in a terminal backwards so that it exits again under the correct name bash mv path_to_file/WMI_Lear.nc_new path_to_file/WMI_Lear.nc

Cell 4 python 3 data = '' data = xr.open_dataset(data_file) print(data) And again the output is correct as after cell 2

Now I (re)emove the data in a terminal so that does not exist under the same name again bash mv path_to_file/WMI_Lear.nc path_to_file/WMI_Lear.nc_new

Cell 5 python 3 data = '' data = xr.open_dataset(data_file) print(data)

Now I expect again the error message that I follows after cell 3, which says that the file does not exist. But, I get the output as If the file would exist.

If I replacepython3 data = xr.open_dataset(data_file) withpython3 data = xr.open_dataset(data_file,cache='old') ``` I get the same problem.

The same issue occurs, if I only change the file. Then the changed file isn't loaded anymore. Deleting the file is just a drastic example.

The same issue occurs, if I just repeatedly run the cell which is supposed to load the file. Then the file change is not loaded anymore. This is a real issue since I would need to restart the kernel always which is just not practical..

Attached you'll find the simple .nc file.

WMI_Lear.nc.zip

 
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   completed xarray 13221727 issue

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