grib2io v2.0.0b1 - xarray backend on Hera?

[lgramer]

We are interested in testing with the xarray backend for grib2io v2. We followed the suggested directions for testing on Hera as below. We did not expect the open_dataset call to succeed (these GRB2 output files include pressure coordinates, height coordinates, and "other" - reading them with xarray and the cfgrib engine, for example, is quite complicated). But it seems that xarray does not "see" the grib2io backend yet either. Please see below:

# module use /scratch1/NCEPDEV/mdl/apps/modulefiles
# module load python/3.10
# module list

Currently Loaded Modules:
  1) intel/2022.1.2   2) hpss/hpss   3) rocoto/1.3.1   4) ncview/2.1.7   5) sutils/default   6) python/3.10

# python3
Python 3.10.8 (main, Nov 24 2022, 14:13:03) [GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> import grib2io
>>> import xarray as xr
>>> 
>>> print(grib2io.__version__)
2.0.0b1
>>>
>>> ds = xr.open_dataset('/scratch2/AOML/aoml-hafs1/Lew.Gramer/ocean/hafsv1_fnl.hycom_hfsb_RiC_0p20/coupled/grb2/2022092518/09l.2022092022092518.hfsb.storm.atm.f126.grb2',engine='grib2io')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/scratch1/NCEPDEV/mdl/apps/python/3.10/lib/python3.10/site-packages/xarray/backends/api.py", line 526, in open_dataset
    backend = plugins.get_backend(engine)
  File "/scratch1/NCEPDEV/mdl/apps/python/3.10/lib/python3.10/site-packages/xarray/backends/plugins.py", line 185, in get_backend
    raise ValueError(
ValueError: unrecognized engine grib2io must be one of: ['netcdf4', 'scipy', 'gini', 'store']

[EricEngle-NOAA]

@lgramer - Thanks for letting us know about this. We did fix this issue in the repo with e0b9ace and will be fixed in Beta 2.

Specifically related to Hera, I just applied a patch to MDL's Python 3.8 and 3.10 which fixes the issue for Beta 1 installations.