Code review for #277

  - Initialise dict with curly brackets
  - Improve exception handling in function 'to_pandas'
  - Improve error message in function 'to_ncCF'

Co-authored-by: Filipe <[email protected]>

erddapy/core/interfaces.py

@@ -17,21 +17,19 @@
 def to_pandas(url: str, requests_kwargs=None, **kw) -> pd.DataFrame:
     """Convert a URL to Pandas DataFrame."""
     if requests_kwargs is None:
-        requests_kwargs = dict()
+        requests_kwargs = {}
     data = urlopen(url, **requests_kwargs)
     try:
         return pd.read_csv(data, **kw)
     except Exception as e:
-        print("Couldn't process response into Pandas DataFrame.")
-        print(f"{type(e)} occurred. Please see below for the traceback.")
-        raise
+        raise ValueError(f"Could not read url {url} with Pandas.read_csv.") from e
 
 
 def to_ncCF(url: str, protocol: str = None, **kw) -> Dataset:
     """Convert a URL to a netCDF4 Dataset."""
     if protocol == "griddap":
         raise ValueError(
-            f"Cannot use ncCF with griddap. The URL you tried to access is: '{url}'.",
+            f"Cannot use .ncCF with griddap protocol. The URL you tried to access is: '{url}'.",
         )
     auth = kw.pop("auth", None)
     return _nc_dataset(url, auth=auth, **kw)