"GRIB_PARAM" attributes are not saving to netcdf #596
Description
User reported locally that this appeared to have changed with new versions of iris-grib,
and I originally thought was due to extension of the "GRIB_PARAM" attribute scheme to GRIB1 data in the latest v0.20 release.
But actually it doesn't work with GRIB2 data either,
so I now think this is actually a bug in newer versions of Iris, i.e. (probably) v3.11
-- TBC
Example:
>>> import iris
>>> from iris.tests import get_data_path
>>>
>>> pth2 = itst.get_data_path(["GRIB", "time_processed", "time_bound.grib2"])
>>>
>>> cube2 = iris.load_cube(pth2)
>>> print(cube2)
air_temperature / (K) (latitude: 73; longitude: 96)
Dimension coordinates:
latitude x -
longitude - x
Scalar coordinates:
forecast_period -11055.0 hours, bound=(-28587.0, 6477.0) hours
forecast_reference_time 1998-03-06 03:00:00
pressure 100000.0 Pa
time 1996-11-30 12:00:00, bound=(1994-12-01 00:00:00, 1998-12-01 00:00:00)
Cell methods:
0 time: mean
Attributes:
GRIB_PARAM GRIB2:d000c000n000
>>>
>>> iris.save(cube2, "tmp2.nc")
/home/h05/itpp/git/iris/iris_main/lib/iris/fileformats/netcdf/saver.py:2668: IrisDeprecation: Saving to netcdf with legacy-style attribute handling for backwards compatibility.
This mode is deprecated since Iris 3.8, and will eventually be removed.
Please consider enabling the new split-attributes handling mode, by setting 'iris.FUTURE.save_split_attrs = True'.
warn_deprecated(message)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/h05/itpp/git/iris/iris_main/lib/iris/io/__init__.py", line 477, in save
result = saver(source, target, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/h05/itpp/git/iris/iris_main/lib/iris/fileformats/netcdf/saver.py", line 2750, in save
sman.write(
File "/home/h05/itpp/git/iris/iris_main/lib/iris/fileformats/netcdf/saver.py", line 647, in write
self.update_global_attributes(global_attributes)
File "/home/h05/itpp/git/iris/iris_main/lib/iris/fileformats/netcdf/saver.py", line 712, in update_global_attributes
_setncattr(self._dataset, attr_name, attributes[attr_name])
File "/home/h05/itpp/git/iris/iris_main/lib/iris/fileformats/netcdf/saver.py", line 271, in _setncattr
return variable.setncattr(name, attribute)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "src/netCDF4/_netCDF4.pyx", line 3087, in netCDF4._netCDF4.Dataset.setncattr
File "src/netCDF4/_netCDF4.pyx", line 1888, in netCDF4._netCDF4._set_att
TypeError: illegal data type for attribute b'GRIB_PARAM', must be one of dict_keys(['S1', 'i1', 'u1', 'i2', 'u2', 'i4', 'u4', 'i8', 'u8', 'f4', 'f8']), got O
>>>
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