Replace loop with lisyt comprehension

Co-authored-by: Sadie L. Bartholomew <[email protected]>

Author: davidhassell

cf/field.py

@@ -454,9 +454,8 @@ def __getitem__(self, indices):
         # below.
         if org_cyclic:
             new_cyclic = new_data.cyclic()
-            for i in org_cyclic:
-                if i not in new_cyclic:
-                    new.cyclic(i, iscyclic=False)
+            [new.cyclic(i, iscyclic=False) for i in org_cyclic if i not in new_cyclic]
+                    
 
         # ------------------------------------------------------------
         # Subspace constructs with data