FIX: remove IPython-pin, add asyncio-loop_policy

appveyor.yml

@@ -28,7 +28,7 @@ install:
   - "activate wradlib"
 
   # Install wradlib dependecies
-  - "conda install -y -q %MKL% gdal numpy scipy matplotlib netcdf4 h5py h5netcdf xarray dask cartopy deprecation xmltodict coverage codecov pytest pytest-cov pytest-xdist pytest-sugar notebook nbconvert ipython=7 psutil tqdm"
+  - "conda install -y -q %MKL% gdal numpy scipy matplotlib netcdf4 h5py h5netcdf xarray dask cartopy deprecation xmltodict coverage codecov pytest pytest-cov pytest-xdist pytest-sugar notebook nbconvert psutil tqdm"
 
   # Some checks
   - "python -VV"

conftest.py

@@ -48,6 +48,11 @@ def from_parent(cls, parent, name):
     def runtest(self):
         cur_dir = os.path.dirname(self.fspath)
 
+        # See https://bugs.python.org/issue37373
+        if sys.version_info[0] == 3 and sys.version_info[1] >= 8 and sys.platform.startswith('win'):
+            import asyncio
+            asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
+
         with self.fspath.open() as f:
             nb = nbformat.read(f, as_version=4)
             try: