Removing more ** from methods

  - Code review for ioos#280

erddapy/core/interfaces.py

@@ -57,7 +57,7 @@ def to_ncCF(
         )
     if requests_kwargs is None:
         requests_kwargs = {}
-    return _nc_dataset(url, **requests_kwargs)
+    return _nc_dataset(url, requests_kwargs)
 
 
 def to_xarray(
@@ -81,7 +81,7 @@ def to_xarray(
     if response == "opendap":
         return xr.open_dataset(url, **xarray_kwargs)
     else:
-        nc = _nc_dataset(url, **requests_kwargs)
+        nc = _nc_dataset(url, requests_kwargs)
         return xr.open_dataset(xr.backends.NetCDF4DataStore(nc), **xarray_kwargs)
 
 
@@ -101,7 +101,7 @@ def to_iris(
         requests_kwargs = {}
     if iris_kwargs is None:
         iris_kwargs = {}
-    data = urlopen(url, **requests_kwargs)
+    data = urlopen(url, requests_kwargs)
     with _tempnc(data) as tmp:
         cubes = iris.load_raw(tmp, **iris_kwargs)
         _ = [cube.data for cube in cubes]

erddapy/core/netcdf.py

@@ -2,14 +2,14 @@
 
 from contextlib import contextmanager
 from pathlib import Path
-from typing import Dict, Generator
+from typing import Dict, Generator, Optional
 from typing.io import BinaryIO
 from urllib.parse import urlparse
 
 from erddapy.core.url import urlopen
 
 
-def _nc_dataset(url, **requests_kwargs: Dict):
+def _nc_dataset(url, requests_kwargs: Optional[Dict] = None):
     """Return a netCDF4-python Dataset from memory and fallbacks to disk if that fails."""
     from netCDF4 import Dataset