make NormalField attribute Optional None

hiddenSymmetries · Sep 13, 2023 · 4165ee1 · 4165ee1
1 parent 3bb191b
commit 4165ee1
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/simsopt/mhd/spec.py b/src/simsopt/mhd/spec.py
@@ -265,7 +265,7 @@ def __init__(self,
         if si.lfreebound:
             self.normal_field = NormalField.from_spec(filename)
         else:
-            self.normal_field = None
+            self.normal_field = Optional[NormalField] = None
 
         # By default, all dofs owned by SPEC directly, as opposed to
         # dofs owned by the boundary surface object, are fixed.