Remove unnecessary new lines; simplify _maybe_cast_to_cftimeindex

xarray/__init__.py

@@ -19,6 +19,7 @@
                            save_mfdataset)
 from .backends.rasterio_ import open_rasterio
 from .backends.zarr import open_zarr
+
 from .conventions import decode_cf, SerializationWarning
 
 try:

xarray/backends/zarr.py

@@ -207,6 +207,7 @@ def encode_zarr_variable(var, needs_copy=True, name=None):
     out : xarray.Variable
         A variable which has been encoded as described above.
     """
+
     var = conventions.encode_cf_variable(var, name=name)
 
     # zarr allows unicode, but not variable-length strings, so it's both

xarray/core/utils.py

@@ -43,18 +43,13 @@ def _maybe_cast_to_cftimeindex(index):
     if not OPTIONS['enable_cftimeindex']:
         return index
     else:
-        try:
-            import cftime  # noqa: F401
-        except ImportError:
-            return index
-        else:
-            if index.dtype == 'O':
-                try:
-                    return CFTimeIndex(index)
-                except TypeError:
-                    return index
-            else:
+        if index.dtype == 'O':
+            try:
+                return CFTimeIndex(index)
+            except (ImportError, TypeError):
                 return index
+        else:
+            return index
 
 
 def safe_cast_to_index(array):