Future warning - xarray

[adybbroe]

Describe the bug
I get a Future warning from xarray when creating a scene object

To Reproduce

# Your code here
from satpy import Scene
from satpy import find_files_and_readers
from datetime import datetime

DATA_DIR = "/home/a000680/laptop/Nordisk/EARS_NWC/data/case_20180314/ears"

myfiles = find_files_and_readers(base_dir=DATA_DIR,
                                 start_time=datetime(2018, 3, 14, 10, 5),
                                 end_time=datetime(2018, 3, 14, 10, 11),
                                 reader='nc_nwcsaf_pps')
scene = Scene(filenames=myfiles)
scene.load(['ct'])

Expected behavior
No future warning

Actual results

(0, ['/home/a000680/usr/src/satpy/satpy/etc/readers/nc_nwcsaf_pps.yaml'], ['nc_nwcsaf_pps'])

/usr/lib64/python2.7/_abcoll.py:391: FutureWarning: iteration over an xarray.Dataset will change in xarray v0.11 to only include data variables, not coordinates. Iterate over the Dataset.variables property instead to preserve existing behavior in a forwards compatible manner.
  return list(self)
/usr/lib64/python2.7/_abcoll.py:391: FutureWarning: calling len() on an xarray.Dataset will change in xarray v0.11 to only include data variables, not coordinates. Call len() on the Dataset.variables property instead, like ``len(ds.variables)``, to preserve existing behavior in a forwards compatible manner.
  return list(self)
/home/a000680/.local/lib/python2.7/site-packages/h5py/__init__.py:36: FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`.
  from ._conv import register_converters as _register_converters

Also, notice the first line above! There seem to be a loose print somewhere!?

Environment Info:

• OS: Linux
• SatPy Version: 0.9.0b1.dev0

[adybbroe]

Ok, the print is in __init__.py.
The warning I will see what I can do...

[djhoese]

@adybbroe while debugging this I turned on all warnings and found this about geotiepoints:

/Users/davidh/repos/git/python-geotiepoints/geotiepoints/interpolator.py:242: DeprecationWarning: elementwise == comparison failed; this will raise an error in the future.
  if np.all(self.hrow_indices == self.row_indices):

import warnings
warnings.simplefilter('always')

[djhoese]

And the warnings only show up in python 2.7.

[adybbroe]

Thanks.
I have verified the above code snippet and the xarray future warning is now gone in the ,aster branch.
This is what I see now:

/home/a000680/.local/lib/python2.7/site-packages/h5py/__init__.py:36: FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`.
  from ._conv import register_converters as _register_converters

I attribute this to h5py.

[adybbroe]

The above h5py warning is gone when I upgrade from 2.7.1 to 2.8.0.