Fix py3 pynio backend

.travis.yml

@@ -39,6 +39,8 @@ matrix:
     env: CONDA_ENV=py36-bottleneck-dev
   - python: 3.6
     env: CONDA_ENV=py36-condaforge-rc
+  - python: 3.6
+    env: CONDA_ENV=py36-pynio-dev
   allow_failures:
   - python: 3.6
     env:
@@ -59,6 +61,8 @@ matrix:
     env: CONDA_ENV=py36-bottleneck-dev
   - python: 3.6
     env: CONDA_ENV=py36-condaforge-rc
+  - python: 3.6
+    env: CONDA_ENV=py36-pynio-dev
 
 before_install:
   - if [[ "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then

ci/requirements-py36-pynio-dev.yml

@@ -0,0 +1,25 @@
+name: test_env
+channels:
+  - conda-forge
+  - ncar
+dependencies:
+  - python=3.6
+  - dask
+  - distributed
+  - h5py
+  - h5netcdf
+  - matplotlib
+  - netcdf4
+  - pynio=dev
+  - pytest
+  - numpy
+  - pandas
+  - scipy
+  - seaborn
+  - toolz
+  - rasterio
+  - bottleneck
+  - pip:
+    - coveralls
+    - pytest-cov
+    - pydap

doc/whats-new.rst

@@ -221,6 +221,9 @@ Bug fixes
   The previous behavior unintentionally causing additional tests to be skipped
   (:issue:`1531`). By `Joe Hamman <https://github.com/jhamman>`_.
 
+- Fix pynio backend for upcoming release of pynio with python3 support 
+  (:issue:`1611`). By `Ben Hillman <https://github/brhillman>`_.
+
 .. _whats-new.0.9.6:
 
 v0.9.6 (8 June 2017)

xarray/backends/pynio_.py

@@ -57,7 +57,7 @@ def open_store_variable(self, name, var):
     def get_variables(self):
         with self.ensure_open(autoclose=False):
             return FrozenOrderedDict((k, self.open_store_variable(k, v))
-                                     for k, v in self.ds.variables.iteritems())
+                                     for k, v in self.ds.variables.items())
 
     def get_attrs(self):
         with self.ensure_open(autoclose=True):

xarray/tests/__init__.py

@@ -49,7 +49,7 @@ def _importorskip(modname, minversion=None):
 has_pydap, requires_pydap = _importorskip('pydap.client')
 has_netCDF4, requires_netCDF4 = _importorskip('netCDF4')
 has_h5netcdf, requires_h5netcdf = _importorskip('h5netcdf')
-has_pynio, requires_pynio = _importorskip('pynio')
+has_pynio, requires_pynio = _importorskip('Nio')
 has_dask, requires_dask = _importorskip('dask')
 has_bottleneck, requires_bottleneck = _importorskip('bottleneck')
 has_rasterio, requires_rasterio = _importorskip('rasterio')