Package: python3-xarray
Version: 0.15.0-3
Severity: important
Dear Maintainer,
I was trying to use to_netcdf() located in
/usr/lib/python3/dist-packages/xarray/backends/api.py on a grib file without
specifying the engine and it appears that the default engine selection end up
on grib engine.
So _get_default_engine calls _get_default_engine_grib as we have a grib file
but this function always raise a ValueError even if cfgrib import succeed but
anyway, there is a real issue with this function as it is returning nothing
while _get_default_engine is expecting an engine.
If we try to, somehow, makes _get_default_engine_grib return cfdisk as engine,
it will still fail as cfgrib is absent of the WRITEABLE_STORES bellow but even
if it would have been present, cfgrib does not implement a writeable store.
WRITEABLE_STORES: Dict[str, Callable] = {
"netcdf4": backends.NetCDF4DataStore.open,
"scipy": backends.ScipyDataStore,
"h5netcdf": backends.H5NetCDFStore.open,
}
I'm quite new dealing with xarray but I think grib engine seems to be on work
in progress or something and doesn't look ready yet.
In order to get the job done, I tryed to make _get_default_engine_grib
returning "netcdf4" based on observation on an older implementation of xarray
(0.10.2-1). This "hack" worked but it is really dirty.
Could you please dig a bit more and fix this issue?
Best regards, and thank you for all job done maintaining theses packages.
-- System Information:
Debian Release: bullseye/sid
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'),
(500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.19.0-8-amd64 (SMP w/1 CPU core)
Kernel taint flags: TAINT_CRAP
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8),
LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages python3-xarray depends on:
ii python3 3.8.2-2
ii python3-numpy 1:1.17.4-5
ii python3-pandas 0.25.3+dfsg-7
Versions of packages python3-xarray recommends:
ii python3-bottleneck 1.2.1+ds1-2+b1
ii python3-dask 2.11.0+dfsg-1
ii python3-h5netcdf 0.7.1-1
ii python3-netcdf4 1.5.3-1+b2
ii python3-zarr 2.4.0+ds-1
Versions of packages python3-xarray suggests:
pn python-xarray-doc <none>
pn python3-cartopy <none>
ii python3-matplotlib 3.2.1-1
pn python3-pydap <none>
pn python3-rasterio <none>
ii python3-scipy 1.3.3-3
pn python3-seaborn <none>
ii python3-toolz 0.9.0-1
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